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135-795: La Jolla Village is bordered by I-5 and University City to the east; Gilman Drive and La Jolla Heights to the west and south and La Jolla Village Drive, UCSD , and Torrey Pines to the north. As of the Census of 2010 , there were 5,783 people living in 3,283 households in La Jolla Village. The population density was 9,064 people per square mile. The racial makeup of La Jolla Village was 69.03% White , 22.10% Asian , 1.68% African American , 0.07% American Indian and Alaska Native , 0.03% Native Hawaiian and Pacific Islander , 2.80% from other races and 4.29% from two or more races. Hispanic or Latino of any race were 9.99%. La Jolla Village

270-736: A U.S.–Mexico border shutdown could be expected following the COVID-19 public health emergency. According to HRW, the new rule introduced by the CDC overlooks the fact that the U.S. is obligated to protect refugees from return to conditions threatening prosecution, as per treaties. President Joe Biden's border executive plan as the COVID-19 restrictions – known as Title 42 – expired in May 2023. Under Title 42, which had been in effect since March 2020, many border crossers have been quickly deported to Mexico without

405-494: A check for VEE. APHIS imposes similar testing and certification requirements on horses from other parts of the world but without the quarantine for VEE. These horses are held in quarantine—usually three days—or until tests are completed. Because the disease equine piroplasmosis (equine babesiosis ) is endemic in Mexico but not established in the U.S., transportation of horses from Mexico to the U.S. requires evaluation of horses for

540-404: A disregard for the ethnic Mexican American population of metropolitan Los Angeles. The "Boyle–Hollenbeck Anti–Golden State Freeway Committee" was formed for the purpose of blocking or rerouting the freeway. Then– Los Angeles City Council member Edward R. Roybal chaired that committee. Despite this opposition, the construction of the freeway went ahead. When this section was completed in 1956,

675-625: A faster and more direct north–south route through the state and so was eventually chosen. Construction began in the early 1960s. There were just three phases for the 321 mi (517 km). The first phase, completed in 1967, ran from the San Joaquin County line to Los Banos. The second phase, completed in 1972, extended the freeway south to Wheeler Ridge and connected it to SR 99. The freeway then started to see traffic, as in Stockton there were only 4 mi (6.4 km) between

810-459: A locked and crowded detention center cell in northern Mexico, with motives ranging from pending deportation to overcrowding and lack of access to drinking water. The border separating Mexico and the U.S. is the most frequently crossed international boundary in the world, with approximately 350 million legal crossings taking place annually. Border crossings take place by roads, pedestrian walkways, railroads and ferries. From west to east, below

945-457: A negative image. There are around 11.5 million undocumented workers in the U.S. today, and 87% of undocumented immigrants have been living in the U.S. for more than 7 years. Local economies that develop on the Mexican side capitalize not only on available skills but also on available, usually discarded, materials. Small businesses trade in clothes that are purchased by the pound and cardboard from

1080-426: A negative test for EIA. Horses from Mexico must have a health certificate; pass negative tests for EIA, dourine, glanders, and EP at a USDA import center; and undergo precautionary treatments for external parasites at the port of entry. Horses from other Western Hemisphere countries must have the same tests as those from Mexico and, except for horses from Argentina , must be held in quarantine for at least seven days as

1215-544: A point 32 km (20 mi) south of the Gila River confluence. The border then follows a series of lines and parallels totaling 859 km (534 mi). First, it follows a straight line from the Colorado River to the intersection of the 31° 20′ parallel north and the 111th meridian west . It then proceeds eastwards along the 31° 20′ parallel north up to a meridian 161 km (100 mi) west of

1350-503: A result, the effect funneled more immigrants to their death even with the assistance of coyotes (smugglers). Not only has this approach caused fatalities throughout the U.S.–Mexico border, but it has even stirred up a nuisance for documented immigrants and American citizens. There has been general concern about the Border Patrol and other agencies abusing their authority by racial profiling and conducting unwarranted searches outside

1485-683: A unique crossover resulting in a left-driving configuration for about 5 mi (8.0 km) before the highway crosses back into its standard alignment. This section is known as the Five Mile Grade. After cresting the Five Mile Grade, the freeway enters the Angeles National Forest . It passes Pyramid Lake and intersects SR 138 before crossing the Tejon Pass through the Tehachapi Mountains near

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1620-474: A valid Merchant Mariner Document when traveling in conjunction with official maritime business; or a valid U.S. military identification card when traveling on official orders. In August 2015, Mexico began enforcing a rule that all foreign citizens that plan to stay in the country for more than seven days or are travelling on business will have to pay a 330 pesos ($ 21) fee and show their passport. When animals are imported from one country to another, there

1755-462: Is a list of the border city "twinnings"; cross-border municipalities connected by one or more legal border crossings. The total population of the borderlands—defined as those counties and municipios lining the border on either side—stands at some 12 million people. The San Ysidro Port of Entry is located between San Ysidro, California and Tijuana, Baja California . Approximately 50,000 vehicles and 25,000 pedestrians use this entry daily. In

1890-597: Is about 80 miles (130 km) west of the highway. I-5 is known colloquially as "the 5" to Southern California residents and "5" to Northern California residents due to varieties in California English . I-5 also has several named portions: the John J. Montgomery Freeway , San Diego Freeway , Santa Ana Freeway , Golden State Freeway , and West Side Freeway . The entirety of Interstate 5 in California

2025-663: Is an international border separating Mexico and the United States , extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border traverses a variety of terrains, ranging from urban areas to deserts. It is the most frequently crossed border in the world with approximately 350 million documented crossings annually. Illegal crossing of the border to enter the United States has caused

2160-469: Is by the means of "prevention through deterrence". Its primary goal is to completely prevent undocumented immigrants from entering the U.S. from Mexico rather than apprehending the unauthorized who are already in the country. As assertive as it was, "prevention through deterrence" was arguably unsuccessful, with a doubling in size of undocumented immigrants population during the two decades leading up to 2014. In order to effectively enforce border protection,

2295-404: Is closed (via SR 58 and SR 14). The interchange has partially collapsed twice due to earthquakes: the 1971 Sylmar earthquake and the 1994 Northridge earthquake . As a result of the 1994 collapse, this interchange was renamed the "Clarence Wayne Dean Memorial Interchange", honoring a Los Angeles Police Department motorcycle officer killed when he was unable to stop in time and drove off

2430-546: Is currently undergoing expansion as part of the North Coast Corridor project. The carpool lane expansion from Lomas Santa Fe Drive to SR 78 fully opened by late 2023. As part of this expansion, the bridge carrying I-5 over San Elijo Lagoon was replaced with a much wider bridge. Previously in 2007, a carpool lane opened between Lomas Santa Fe Drive and I-805, with a continuation of the lanes on I-805 to Governor Drive opening in 2016. There are plans to construct

2565-598: Is defined in the California Streets and Highways Code as Route 5 , which is defined as such in section 305: Route 5 is from the international boundary near Tijuana to the Oregon state line via National City , San Diego , Los Angeles , the westerly side of the San Joaquin Valley , Sacramento , and Yreka ; also passing near Santa Ana , Glendale , Woodland , and Red Bluff . I-5 is part of

2700-582: Is named the John J. Montgomery Freeway in honor of John J. Montgomery , a pioneer aviator who flew a glider from a location near Chula Vista in 1884. I-5 continues northwest from downtown as the San Diego Freeway until it reaches its junction with I-8 , then turns slightly to the north while passing SeaWorld and Mission Bay . Thereafter, I-5 intersects the western end of SR 52 near La Jolla before entering University City . At Nobel Drive,

2835-484: Is paralleled by U.S. Border Patrol interior checkpoints on major roads generally between 40 and 121 km (25 and 75 mi) from the U.S. side of the border, and garitas generally within 50 km (31 mi) of the border on the Mexican side. There are an estimated half a million illegal entries into the U.S. each year. Border Patrol activity is concentrated around border cities such as San Diego and El Paso which have extensive border fencing. This means that

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2970-581: Is recommended. Animals crossing the U.S.–Mexico border may have a country of origin other than the country where they present for inspection. Such animals include those from the U.S. that cross to Mexico and return, and animals from other countries that travel overland through Mexico or the U.S. before crossing the border. APHIS imposes precautions to keep out several equine diseases, including glanders , dourine , equine infectious anemia , equine piroplasmosis , Venezuelan equine encephalitis , and contagious equine metritis . APHIS also checks horses to prevent

3105-780: Is served by Torrey Pines Elementary School (K-5) in La Jolla Heights, Muirlands Middle School (6-8) in the Muirlands, La Jolla High School (9-12) in the Beach-Barber Tract and University City High School (9-12) in University City. The neighborhood is also adjacent to the University of California, San Diego campus. La Jolla Village is served by the I-5 and SR-52 freeways, several MTS bus routes and

3240-534: Is still listed as a control city on northbound I-5 between SR 99 and I-580. Interstate 5 in downtown Sacramento closely follows the Sacramento River. This has resulted in complex engineering work to keep the section dry due to it being located below the water table. Locally, Caltrans refers to this part of the freeway as the "Boat Section". Due to record levels of rainfall in 1980 the Boat Section

3375-595: Is the current route of I-5. Both routes were eventually built as freeways. The Gavin Canyon route became I-5, and the main north–south route via the Ridge Route. The Newhall Pass route became SR 14, which is the main route between Los Angeles and the growing high desert communities of the Antelope Valley . It is also still a part of the important Midway Route, which is the primary alternate route when I-5

3510-526: Is the possibility that diseases and parasites can move with them. Thus, most countries impose animal health regulations on the import of animals. Most animals imported to the U.S. must be accompanied by import permits obtained in advance from the U.S. Department of Agriculture 's Animal and Plant Health Inspection Service (APHIS) and/or health certification papers from the country of origin. Veterinary inspections are often required, and are available only at designated ports; advance contact with port veterinarians

3645-553: Is today California , Arizona , New Mexico , Utah , Nevada and parts of what is Colorado , Wyoming , Kansas , and Oklahoma . In addition, all disputes over Texas and the disputed territory between Rio Grande and Rio Nueces were abandoned. Five years later, the Gadsden Purchase completed the creation of the current U.S.–Mexico border. The purchase was initially to accommodate a planned railway right-of-way . These purchases left approximately 300,000 people living in

3780-735: The California Freeway and Expressway System , and is part of the National Highway System , a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration . The segment of I-5 from State Route 89 (SR 89) to US 97 forms part of the Volcanic Legacy Scenic Byway , an All-American Road . I-5 is also eligible to be included in

3915-534: The Chihuahuan and Sonoran deserts to the Colorado River Delta and San Diego–Tijuana , before reaching the Pacific Ocean. The Mexico–United States border extends 3,145 kilometers (1,954 miles), in addition to the maritime boundaries of 29 km (18 mi) into the Pacific Ocean and 19 km (12 mi) into the Gulf of Mexico . It is the tenth-longest border between two countries in

4050-471: The Customs and Border Protection , specifically the Border Patrol, 600 million dollars to implement and improve security. The U.S. government has invested many millions of dollars on border security , although this has not stopped undocumented immigration in the U.S. In June 2018, the U.S. government announced installation of facial recognition system for monitoring immigrant activities. The Border Patrol

4185-574: The Government Accountability Office released a report stating that the U.S. Border Patrol intercepted 61% of individuals illegally crossing the border in 2011, which translates to 208,813 individuals not apprehended. 85,827 of the 208,813 would go on to illegally enter the U.S., while the rest returned to Mexico and other Central American countries. The report also shows that the number of illegal border crossings has dropped. The apprehensions per (fiscal) year are shown in

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4320-659: The Klamath River and reaching the Oregon border and the Siskiyou Summit . North of Redding, I-5 regularly gets snow at higher elevations from fall to spring. Caltrans sometimes requires vehicles to use snow tires , snow chains , or other traction devices in the mountains during and after snowstorms . Checkpoints are often set up to enforce chain restrictions on vehicles bound for icy or snowy areas. When chain restrictions are in effect, vehicles must have chains on

4455-470: The Mexico–United States border crisis . It is one of two international borders that the United States has, the other being the northern Canada–United States border ; Mexico has two other borders: with Belize and with Guatemala . Four American states border Mexico: California , Arizona , New Mexico and Texas . One definition of Northern Mexico includes only the six Mexican states that border

4590-750: The SR ;4 freeway that provides access to downtown Stockton. I-5 passes through the western portion of the Lodi city limits before intersecting SR 12 and entering Sacramento County . I-5 enters the city of Elk Grove while passing along the eastern edge of the Stone Lakes National Wildlife Refuge . It then crosses into the Sacramento city limits, soon paralleling the Sacramento River before intersecting

4725-610: The San Diego LDS Temple towers over I-5. Shortly afterward, I‑5 passes through the UC San Diego campus and intersects the northern terminus of I-805 before continuing north and intersecting the western end of SR 56 . At this interchange, there is a local bypass that provides the only access to Carmel Mountain Road from both directions and provides the only direct access to SR 56 going northbound. North of

4860-787: The San Luis Reservoir (where SR 152 provides a major connection to the Monterey Peninsula and the Silicon Valley ), and SR 140 at the Stanislaus county line. I-5 crosses the California Aqueduct for the third time between SR 152 and SR 33 and again near Crows Landing . In San Joaquin County , I-580 splits off from I-5 south of Tracy, providing a spur-route connection to

4995-830: The San Onofre Nuclear Generating Station . I-5 enters Orange County at the Cristianitos Road exit. Upon entering Orange County, I-5 goes through San Clemente . At Dana Point , I-5 turns inland while SR 1 continues along the coast. I-5 then heads due north through San Juan Capistrano and Mission Viejo , intersecting the SR 73 toll road heading northwest. I-5 continues to the El Toro Y interchange with I-405 in southeastern Irvine , splitting into lanes for regular traffic as well as for truck traffic (though autos can use these lanes as well). From that point, I-405 takes over

5130-595: The Shasta Cascade region, intersecting SR 273 in Anderson before passing through Redding and intersecting SR 44 and SR 299 . The freeway then continues through the city of Shasta Lake , intersecting SR 151 , before crossing over Shasta Lake on the Pit River Bridge and climbing up to near the foot of Mount Shasta . Just north of the bridge over Shasta Lake, I-5 also boasts

5265-728: The State Scenic Highway System ; however, it is a scenic highway as designated by the California Department of Transportation (Caltrans) only from SR 152 to I-580 . I-5 begins at the San Ysidro Port of Entry from Mexico in the San Ysidro neighborhood of San Diego. Immediately after the border, I-805 splits off to the northeast and serves as a bypass of I-5 that avoids downtown San Diego . I-5 itself continues northwest and meets

5400-655: The Burbank Boulevard bridge replacement was completed in 2021. The fourth and final phase is in the Santa Clarita Valley, where Caltrans is undergoing construction to extend the carpool lane from the Newhall Pass interchange to Parker Road in Castaic. These lanes are scheduled to open to traffic in 2026. A fifth phase to build a flyover which will connect I-405's carpool lanes with I-5's is in

5535-608: The Capital City Freeway, which carries US 50 and I-80 Business (I-80 Bus.). SR 99 merges with I-5 at this point, and the two routes pass through the western half of downtown Sacramento . Following the bridge over the American River , I-5 and SR 99 intersect the major transcontinental route of I-80 . Just as I-5 leaves Sacramento, SR 99 splits off and continues north while I-5 turns due west past Sacramento International Airport and crosses

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5670-625: The El Paso-Juarez area, in effect transferring the land to the U.S.. By a treaty negotiated in 1963, Mexico regained most of this land in what became known as the Chamizal dispute and transferred 1.07 km (260 acres) in return to the U.S. Border treaties are jointly administered by the International Boundary and Water Commission (IBWC), which was established in 1889 to maintain the border, allocate river waters between

5805-683: The Golden State Highway (US 99, later SR 99) into a freeway. The other was to use the proposed West Side Freeway (current Interstate 5), which had been endorsed by local groups as early as 1945. The Golden State Highway route would serve many farming communities across the San Joaquin Valley, but the West Side Freeway proposal would bypass all the Central Valley communities and thus provide

5940-761: The Line in El Paso ; Operation Rio Grande in McAllen ; Operation Safeguard in Tucson ; and the Arizona Border Control Initiative along the Arizona border. According to Vulliamy, one in five Mexican nationals will visit or work in the U.S. at one point in their lifetime. As of 2010, the border is guarded by more than 20,000 Border Patrol agents, more than at any time in its history. The border

6075-646: The Los Angeles– Kern county line, with Path 26 power lines generally paralleling the freeway. After entering Kern County, the freeway sharply descends for 12 mi (19 km) from 4,144 ft (1,263 m) at the Tejon Pass to 1,499 ft (457 m) at Grapevine near the southernmost point of the San Joaquin Valley , approximately 30 mi (48 km) south of Bakersfield and 5 mi (8.0 km) south of its interchange with SR 99 at Wheeler Ridge . This stretch of I-5 through

6210-405: The Mexican economy overall, 25% of it in the border regions. The U.S. Immigration Act of 1891 authorized the implementation of inspection stations at ports of entry along the Mexican and Canadian borders. The U.S. Immigration Act of 1917 required the passing of a literacy test and a head tax by Mexicans wanting to enter the U.S. legally; however, during World War I , when labor shortages grew,

6345-459: The Rio Grande under the 1905 convention, which occurred on 37 different dates from 1910 to 1976, the transferred land was small (ranging from one to 646 acres) and uninhabited. The Rio Grande Rectification Treaty of 1933 straightened and stabilized the river boundary through the highly developed El Paso-Juárez valley. Numerous parcels of land were transferred between the two countries during

6480-412: The Rose Canyon Bike Path. A Mid-Coast Trolley station is located on Nobel Drive on the west side of I-5. Interstate 5 in California Interstate 5 ( I-5 ) is a major north–south route of the Interstate Highway System in the United States, running largely parallel to the Pacific Coast between the Mexican border and the Canadian border . The segment of I-5 in California runs across

6615-465: The Sacramento River into Yolo County . In Woodland , the SR 113 freeway merges with I-5 before exiting to the north. The Interstate heads northwest again toward Dunnigan , where it converges with I-505 . I-5 skirts north along the western edge of the Sacramento Valley , bypassing the larger cities of the region, including Yuba City , Oroville and Chico , before reaching Red Bluff . From Dunnigan, I-5 enters Colusa County , passing through

6750-405: The San Diego Freeway designation, while I-5 becomes the Santa Ana Freeway as it runs southeast to northwest. After the El Toro Y junction, I-5 intersects SR 133 , a toll road that eventually connects to SR 241 . Just before the Tustin city limits, I-5 passes over SR 261 , the final toll road of the Eastern Transportation Corridor , but traffic must use Jamboree Road to access

6885-486: The San Diego city limits, I-5 enters the city limits of Solana Beach , and then three incorporated cities to the north: Encinitas , Carlsbad and Oceanside . In Oceanside, I-5 intersects the SR 78 freeway and the SR 76 expressway and continues through Camp Pendleton . It then follows the Pacific Ocean coastline for the next 18 mi (29 km). Toward the northern end of its routing through Camp Pendleton, I-5 passes through San Onofre State Beach and near

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7020-443: The San Francisco Bay Area. From here, I-5 crosses the California Aqueduct for the final time and intersects SR 132 , a major route to Modesto and the mountains in the east, as well as the northern end of SR 33. After passing Tracy, I-5 intersects I-205 , a connector route to I-580, before intersecting the SR 120 freeway near Manteca . After passing through Lathrop , I-5 heads due north through Stockton, intersecting

7155-453: The San Joaquin Valley via the Mojave Desert and Tehachapi Pass . In 1910, Beale's Cut was bypassed by the Newhall Tunnel. Constructed by Los Angeles County, it was too narrow for two trucks to pass each other inside. As a result, in 1939, the tunnel was completely removed (or " daylighted ") when the road was widened to four lanes. Additionally, by 1930, a bypass road was constructed to avoid Newhall Pass via Weldon and Gavin canyons, which

7290-439: The Tejon Pass and Grapevine typically gets snow at higher elevations during the winter. Although Caltrans may require vehicles to use snow tires , snow chains , or other traction devices during and after snowstorms , the California Highway Patrol will instead usually close this segment altogether during these conditions because of the steep grade of the pass, and the amount of passenger traffic and big-rigs that generally use

7425-423: The U.S. Federal Bureau of Investigation to monitor suspicious activities and potential violence at the border. Within 10 years, frequent provocations caused border towns to transform into battlefields, which intensified transborder restrictions, brought federal soldiers to patrol the border, and caused the construction of fences and barriers between border towns. When the battles concluded, restrictions for crossing

7560-466: The U.S. Some items, like the used tires found everywhere along the border, are made into certain items that support local economies and define a border. The Secure Fence Act of 2006 was passed providing for the construction of 1,127 km (700 mi) of high-security fencing. Attempts to complete the construction of the Mexico–United States barrier have been challenged by the Mexican government and various U.S.–based organizations. In January 2013,

7695-413: The U.S. and the Mexican government's support for financial investments from the U.S. Railroads were built that connected the northern Mexican states more to the U.S. than to Mexico, and the population grew tremendously. The mining industry also developed, as did the U.S.'s control of it. By the early 20th century companies from the U.S. controlled 81% of the mining industry and had invested US$ 500 million in

7830-456: The U.S. by air: a valid passport ; a passport card ; a state enhanced driver's license or state enhanced non-driver ID card (available in Michigan , New York , Vermont , and Washington ) approved by the Secretary of Homeland Security; a trusted traveler program card ( Global Entry , NEXUS , FAST , or SENTRI ); an enhanced tribal identification card; a Native American Tribal Photo Identification Card; Form I-872 – American Indian Card;

7965-404: The U.S. ceded 6 islands in the Rio Grande to Mexico. At the same time, Mexico ceded 3 islands and 2 bancos to the U.S. This transfer, which had been pending for 20 years, was the first application of Article III of the 1970 Boundary Treaty. On March 27, 2023, at least 38 detained migrants (mostly from Central America) were killed—and dozens more injured—in a fire started in protest inside

8100-401: The U.S. settled all outstanding boundary disputes and uncertainties related to the Rio Grande border. The U.S. states along the border, from west to east, are California , Arizona , New Mexico , and Texas . The Mexican states along the border are Baja California , Sonora , Chihuahua , Coahuila , Nuevo León , and Tamaulipas . Among the U.S. states, Texas has the longest stretch of

8235-429: The U.S. was between 1909 and 1911 in California, the first barrier built by Mexico was likely in 1918; barriers were extended in the 1920s and 1940s. The Banco Convention of 1905 between the U.S. and Mexico allowed, in the event of sudden changes in the course of the Rio Grande (as by flooding), for the border to be altered to follow the new course. The sudden changes often created bancos (land surrounded by bends in

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8370-412: The U.S.' policies and regulations have looked to make border crossings more hazardous through the implementation of various operations, one of those being the "funnel effect". The tactic was meant to discourage migration from Mexico into the U.S. by forcing migrants to travel further around barriers where the terrain and weather are more risky, but the strategy was not as successful as initially planned. As

8505-440: The U.S., I-5 crosses directly to Tijuana, and the highway's southern terminus is this crossing. In 2005, more than 17 million vehicles and 50 million people entered the U.S. through San Ysidro . Among those who enter the U.S. through San Ysidro are transfronterizos , American citizens who live in Mexico and attend school in the U.S. It has influenced the every day lifestyle of people that live in these border towns . Along

8640-431: The U.S., 90% were from Mexico alone. In addition, there are more than 6 million undocumented Mexican nationals residing in the U.S. The border has a very high rate of documented and undocumented migrant crossings every year. With such a high rate of people crossing annually to the U.S., the country has invested in several distinct security measures. In 2010, President Barack Obama signed an appropriation bill which gave

8775-463: The U.S.: Baja California , Chihuahua , Coahuila , Nuevo León , Sonora and Tamaulipas . It is the tenth-longest border between two countries in the world. The total length of the continental border is 3,145 kilometers (1,954 miles). From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at Ciudad Juárez, Chihuahua , and El Paso, Texas . Westward from El Paso–Juárez , it crosses vast tracts of

8910-509: The Utica Avenue exit to I-580, I-5 parallels the eastern foothills of the Diablo Range . It crosses the California Aqueduct for the second time. In Kings County, I-5 intersects SR 41 before briefly entering the city limits of Avenal, where it intersects SR 269 . In Fresno County , I-5 intersects SR 198 and SR 145 before running concurrently with SR 33 for several miles. I-5 then crosses into Merced County , intersecting SR 165 , SR 152 and SR 33 near

9045-480: The West Side Freeway (I-5) saw the development of businesses serving the needs of travelers. For years, there has still been interest in designating the Golden State Highway route as its own interstate, I-7 or I-9 . The median on I-5 between Wheeler Ridge and Tracy is wide enough to accommodate widening the West Side Freeway to six or eight lanes, should the need arise. I-5's more direct Los Angeles-to-Sacramento route bypasses San Francisco, San Jose , Oakland , and

9180-431: The West Side Freeway and the Golden State Highway. The third phase, completed in 1979, extended the freeway to Sacramento and connected it to the northern I-5. When the second phase of the freeway opened in 1972, it was a long and lonely route with no businesses alongside. Services were not easily available as the nearest towns were miles away and generally out of sight. It was common for cars to run out of fuel. Over time

9315-401: The border every day is causing air pollution in San Ysidro and Tijuana. The emission of carbon monoxide (CO) and other vehicle related air contaminants have been linked to health complications such as cardiovascular disease, lung cancer, birth outcomes, premature death, obesity, asthma and other respiratory diseases. The high levels of traffic collusion and the extended wait times has affected

9450-503: The border regions reflected this. As the infrastructure of communities on the U.S. side continued to improve, the Mexican side began to fall behind in the construction and maintenance of important transportation networks and systems necessary to municipal development. Although the Mexican Revolution caused insecurity in Mexico, it also strained U.S.–Mexico relations. With the Mexican Revolution lasting for 10 years, ending in 1920, and World War I simultaneously occurring between 1914 and 1918,

9585-420: The border was reaffirmed in the 1828 Treaty of Limits . Mexico attempted to create a buffer zone at the border that would prevent possible invasion from the north. The Mexican government encouraged thousands of their own citizens to settle in the region that is now known as Texas and even offered inexpensive land to settlers from the U.S. in exchange for populating the area. The influx of people did not provide

9720-489: The border were relaxed and most soldiers were sent home; however, the fences remained as a physical reminder of the division between the two nations. As years passed, more fences and higher barriers were established as attentions focused on the boundary demarcation between the U.S. and Mexico. The first international bridge was the Brownsville & Matamoros International Bridge built in 1910. The first barrier built by

9855-467: The border with Mexico, while California has the shortest. Among the states in Mexico, Chihuahua has the longest border with the U.S., while Nuevo León has the shortest. Along the border are 23 U.S. counties and 39 Mexican municipalities . In the mid-16th century, after the discovery of silver, settlers from various countries and backgrounds began to arrive in the area. This period of sparse settlement included colonizers from different backgrounds. The area

9990-405: The border, according to Mexican political scientist Armand Peschard-Sverdrup . The economic development of the border region on the Mexican side of the border depended largely on its proximity to the U.S., because of its remoteness from commercial centers in Mexico. During the years of Mexican President Porfirio Díaz , between 1876 and 1910, the border communities boomed because of close ties to

10125-448: The carpool lanes of SR 14 and I-5 opened in 2014. The second phase was between Buena Vista Street and SR 170, and the carpool lane opened in 2014. This phase also included a flyover between the existing carpool lane of SR 170 and the newly constructed I-5. The freeway in this phase went through no improvements, and used existing median shoulders to construct the HOV lane, thus all

10260-564: The carpool lanes on the SR ;170 and SR 14 freeways (an additional direct connector with the HOV lanes on I-405 near Mission Hills is planned. ) This allows a continuous HOV lane to run from Palmdale to North Hollywood via SR 14 to I-5 to SR 170. I-5 continues along the western city limits of Santa Clarita and passes Six Flags Magic Mountain , intersecting SR 126 just north of there. The Golden State Freeway then rises sharply, passing by Lake Castaic and undergoing

10395-555: The city limits of San Diego. I-5 subsequently intersects with four state routes: the southern end of SR 15 (the extension of I-15 ), SR 75 and the Coronado Bridge , the western end of SR 94 , and SR 163 . In addition to serving downtown San Diego, I-5 also provides access to Balboa Park from the Pershing Drive exit. The portion of I-5 from the Mexican border to SR 94 at downtown San Diego

10530-513: The city of Williams and intersecting SR 20 . In Glenn County , I-5 intersects SR 162 in Willows and SR 32 in Orland . I-5 then crosses into Tehama County , passing through Corning before entering Red Bluff and intersecting SR 36 , which connects to the northern end of SR 99. I-5 crosses the Sacramento River twice before entering Shasta County . I-5 then enters

10665-551: The coast of Baja California, there are neighborhoods of Americans living in Tijuana, Rosarito Beach , and Ensenada , whose residents commute to the U.S. daily to work. Additionally, many Mexicans also enter the U.S. to commute daily to work. In 1999, 7.6% of the labor force of Tijuana was employed in San Diego. The average wait time to cross into the U.S. is approximately an hour. The thousands of vehicles that transit through

10800-433: The collapsed flyover ramp from SR 14 south to I-5 south. After both earthquakes, the collapsed portions were rebuilt and surviving portions reinforced. In the evening of October 12, 2007, two trucks collided in the southbound tunnel that takes the truck bypass roadway under the main lanes near the Newhall Pass interchange. Fifteen trucks caught fire, killing three people and injuring ten. The Ridge Route refers to

10935-491: The construction period, 1935–1938. At the end, each nation had ceded an equal area of land to the other. The Boundary Treaty of 1970 transferred an area of Mexican territory to the U.S., near Presidio and Hidalgo, Texas , to build flood control channels. In exchange, the U.S. ceded other land to Mexico, including five parcels near Presidio, the Horcon Tract and Beaver Island near Roma, Texas . On November 24, 2009,

11070-453: The corridor. Whenever there is such a closure, traffic must either wait for it to reopen, or endure a multi-hour detour. An automated gate on the freeway's median in Castaic north of Lake Hughes Road allows drivers to turn around when such closures occur. From SR 99 at Wheeler Ridge to Woodland , I-5 is known as the West Side Freeway. I-5 parallels SR 33 , skirting along

11205-545: The county line, I-5 goes through several cities southeast of Los Angeles, including La Mirada , Santa Fe Springs , and Norwalk . In Downey , I-5 intersects I-605 , which serves as a north–south connector route between the cities east of Los Angeles, including those in the San Gabriel Valley . I-5 then enters Commerce , passing the Citadel Outlets shopping center, and intersects I-710 before entering

11340-618: The county line. At an OCTA board meeting in August 2024, it was discussed that preliminary engineering is ongoing and will be complete next year. However, a timeline for actual construction was not provided. This extension would give way for I-5 to have carpool lanes for its entire length in Orange County, plus the newly widened section in Los Angeles County, for a total of 50 miles. OCTA and Caltrans are expected to work with

11475-671: The defense that Mexico had hoped for and instead Texas declared its independence in 1836, which lasted until 1845 when the U.S. annexed it. The constant conflicts in the Texas region in the mid-19th century eventually led to the Mexican–American War , which began in 1846 and ended in 1848 with the Treaty of Guadalupe Hidalgo . In the terms of the peace treaty, Mexico lost more than 2,500,000 square kilometers (970,000 sq mi) of land, 55% of its territory, including all of what

11610-508: The division between the U.S. and Mexico began to polarize the two nations. Constant battles and raids along the border made both authorities nervous about borderland security. The Zimmerman Telegram , a diplomatic cable sent by Germany but intercepted and decrypted by British intelligence, was meant to bait Mexico into war with the U.S. in order to reconquer what was taken from them during the Mexican-American War. This inspired

11745-451: The driving wheels, except 4WD vehicles with snow tires. Additionally, during the winter season, trucks are required to carry chains whether or not controls are in force. The portion of this highway from Los Angeles to San Diego was also co-signed as US 101 until 1964–1968. The portion of this highway from Woodland to Red Bluff roughly follows old US 99W. In California, the former western branch of Interstate 5 (the northern end of

11880-476: The exception of the 40 km (25 mi) border zone, but still within the 161 km (100 mi) border zone. In 2012, Border Patrol agents made over 364,000 arrests of people illegally entering the country. Considerable success has been achieved in restoring integrity and safety to the border, by putting in place a border-control strategy. These include Operation Gatekeeper in San Diego ; Operation Hold

12015-560: The far more remote western edge of the Central Valley , and is largely removed from the major population centers such as Bakersfield, Fresno and Modesto ; other state highways provide connections. I-5 still runs within the vicinity of Avenal , Coalinga , Los Banos , and a handful of other smaller cities on the western edge of the Central Valley. For most of this section, the Path ;15 electrical transmission corridor follows

12150-472: The flow of illegal immigrants is diverted into rural mountainous and desert areas, leading to several hundred migrant deaths along the Mexico–U.S. border of those attempting to cross into the U.S. from Mexico illegally and vice versa. Undocumented labor contributes $ 395 billion to the economy every year. While the U.S. is in favor of immigration, the increase in undocumented immigration has given border-crossing

12285-443: The freeway from the Sacramento River. However, the system slowly clogged up over the years with sand and silt buildup Major repair work of the Boat Section began on May 30, 2008. The construction was to take 40 days to complete, requiring complete northbound and southbound closures on an alternating schedule. In 1992, Caltrans finished upgrading the final 13 mile segment north of Lakehead . I-5 through north San Diego County

12420-429: The graph; they reached a maximum of over 1.643 million in the year 2000. Similar numbers had been reached in 1986 with over 1.615 million. The increase of border security throughout the years has progressively made crossings at the U.S.–Mexico border more dangerous, which has developed a human rights crisis at the border. The number of migrant deaths occurring along the U.S.–Mexico border has dramatically increased since

12555-602: The highway, forming an infrastructure corridor along with the California Aqueduct . After the Grapevine, I-5 crosses the California Aqueduct. This is first time out of 5 times that I-5 crosses the aqueduct. North of the Grapevine, I-5 intersects SR 166 , SR 119 and SR 43 before meeting SR 58 , a highway that continues east to Bakersfield, near the town of Buttonwillow . I-5 then intersects SR 46 before entering Kings County . From

12690-576: The implementation of the funnel effect. Along the Arizona-Mexico border, only seven migrant deaths were recorded in 1996; however, the remains of over 2,000 migrants were discovered from 2001 to 2012. Since the majority of deaths occur in rural areas, where extreme temperatures are common, it is likely the number of recorded deaths are far below the total. Because of the harsh, inaccessible terrain, human remains may not be found for years or ever. The Human Rights Watch cited on April 22, 2020, that

12825-489: The introduction of ticks and other parasites. In the Lower Rio Grande Valley, U.S. Department of Agriculture inspectors look for horses and livestock that stray across the border carrying ticks. These animals are often called wetstock, and the inspectors are referred to as tickriders. Per APHIS, horses originating from Canada can enter the U.S. with a Canadian government veterinary health certificate and

12960-745: The large unincorporated community of East Los Angeles and later the city proper of Los Angeles . When the freeway reaches the East Los Angeles Interchange 1 mi (1.6 km) east of downtown Los Angeles, I-5 becomes the Golden State Freeway as US 101 takes over the Santa Ana Freeway designation. At this interchange, I-10 , SR 60 , and US 101 intersect; I-10 continues north on I-5 for about 2 mi (3.2 km) before continuing east towards San Bernardino and points farther east. On

13095-567: The last three miles from SR 78 to Oceanside Harbor Drive, however, there is a lack of funding for them, and there are no plans to set aside funding from the state to construct them. In Orange County, the HOV lane opened in the mid-1990s between SR 1 and SR 91, following the widening of the freeway between SR 55 and SR 91, between SR 91 and Artesia Boulevard in 2010, and between SR 1 and Avenida Pico in 2018. Multiple carpool flyovers were constructed during this time to connect motorists from one freeway's carpool lanes to

13230-555: The latter. I-5 then intersects SR 55 and enters Santa Ana , the county seat of Orange County. Towards the northern side of Santa Ana, I-5 intersects both SR 57 and SR 22 in what is known as the Orange Crush interchange . Following this, I-5 briefly enters the city of Orange and then traverses Anaheim , passing along the north side of Disneyland . I-5 then intersects SR 91 , passes through Buena Park and crosses into Los Angeles County . After crossing

13365-558: The length of the state from the Mexican border at the San Ysidro Port of Entry in the San Ysidro neighborhood of San Diego to the Oregon state line south of the Medford - Ashland metropolitan area. It is the longest interstate in California at 796.77 miles (1,282.28 km), and accounts for more than half of I-5's total length of 1,381.29 miles (2,222.97 km). It is also the second longest stretch of Interstate Highway (and

13500-504: The longest for a north-south Interstate) with a single designation within a single state after I-10 in Texas . It is the more important and most-used of the two major north–south routes on the Pacific Coast, the other being U.S. Route 101 (US 101), which is primarily coastal. I-5 links the major California cities of San Diego, Santa Ana , Los Angeles , Stockton , Sacramento , and Redding . The San Francisco Bay Area

13635-419: The mental health, stress levels, and aggressive behavior of the people who cross frequently. The San Ysidro border is heavily policed, separated by three walls, border patrol agents and the U.S. Immigration and Customs Enforcement . Tijuana is the next target for San Diegan developers because of its fast-growing economy, lower cost of living, cheap prices and proximity to San Diego. While this would benefit

13770-681: The name was chosen in a public contest in 1927, but was never officially adopted. Since the construction of I-5, it has taken over the term "Golden State Freeway" from 99 south of the latter's southern terminus in Kern County. The Golden State Freeway was proposed by the California Highway Commission in 1953. The proposal drew strong criticism from East Los Angeles residents as it would dissect and eliminate large residential and commercial areas of Boyle Heights and Hollenbeck Heights. The proposal also seemed to indicate

13905-467: The newspaper The Eastside Sun wrote the freeway led to the "eradication, obliteration, razing, moving, ripping asunder, demolishing of Eastside homes." A widowed Edendale resident, Lomie Puckett, resisted the condemnation of one of her rental properties in August 1958 by using a rifle to threaten state workers and police. After a five-day standoff with police, the home was seized and later demolished. The section between Orange County and Los Angeles

14040-536: The next (see Exit List for a list of them). In 2013, ground broke on a major expansion of the freeway through La Mirada and Norwalk in neighboring Los Angeles County to the I-605 interchange, which included a carpool lane to Florence Avenue. The carpool lane fully opened in 2023. Currently, in San Clemente, there are studies to extend the carpool lanes from their current terminus at Avenida Pico to Cristianitos Road at

14175-701: The north side of downtown, the Golden State Freeway follows the Los Angeles River , intersects SR 110 and SR 2 and passes along the eastern side of Griffith Park . The route continues through the San Fernando Valley , intersecting the Ventura Freeway (SR 134). It briefly enters the city of Glendale and then Burbank , passing near Burbank Airport before reentering the Los Angeles city limits and intersecting

14310-737: The northern end of the Hollywood Freeway (SR 170). Near the city of San Fernando , I-5 intersects SR 118 . Following this, I-5 intersects three routes in succession: the northern end of I-405, the western end of I-210 , and the southern end of SR 14 at the Newhall Pass interchange . It then crosses the Newhall Pass through the Santa Susana Mountains into the Santa Clarita Valley . I-5's carpool lanes also have direct connectors with

14445-408: The old Ridge Route, but was not enough to satisfy demand, and a conversion to a four-lane expressway was needed. The outbreak of World War II delayed this until 1948 and the fourth lane was completed in 1952. However, just three years later, plans were begun for converting the four-lane expressway to a six-lane freeway. The last major alteration to the Ridge Route began in the early 1960s. By then,

14580-407: The once disputed lands, many of whom were Mexican nationals. Following the establishment of the current border, several towns sprang up along this boundary, and many of the Mexican citizens were given free land in the northern regions of Mexico in exchange for returning and repopulating the area. The Treaty of Guadalupe Hidalgo and another treaty in 1884 were the agreements originally responsible for

14715-521: The original overpasses were retained, and some undercrossings also have no right hand shoulder as a result. A third phase saw the widening between SR 134 and Buena Vista Street, and the carpool lane opened in 2022. This phase gave room for the replacement of the Burbank Boulevard bridge, and the opening of a new interchange at Empire Avenue, which replaced the Scott Road and Lincoln Street interchanges. The Empire Avenue interchange opened in 2019 and

14850-457: The plan for a six-lane freeway had expanded to eight lanes. This construction project made the most changes to the route. Many of the curves that followed the mountainside were cut through. To climb the mountain on the south side of Castaic more easily, traffic lanes were reversed (southbound lanes to the east and northbound lanes to the west). To prevent head-on collisions , the two ends of the route were separated on two different mountainsides, and

14985-544: The point where the Rio Grande crosses the 31° 47′ parallel north, It then proceeds northwards along that meridian up to the 31° 47′ parallel north and then eastwards along that parallel until it meets the Rio Grande. According to the International Boundary and Water Commission , the continental border then follows the middle of the Rio Grande—according to the 1848 Treaty of Guadalupe Hidalgo between

15120-466: The poor run the risk of being impacted by the gentrification of Tijuana. In late 2006, the U.S. Department of Homeland Security (DHS) announced a rule regarding new identification requirements for U.S. citizens and international travelers entering the U.S. implemented on January 23, 2007. This final rule and first phase of the WHTI specifies nine forms of identification, one of which is required to enter

15255-548: The presence of this disease. A leading exception to this rule is the special waiver obtained by riders participating in the Cabalgata Binacional Villista (see cavalcade ). Import from the U.S. to Mexico requires evidence within the prior 45 days of freedom from EIA, among other requirements. Data from the U.S. Border Patrol Agency's 2010 annual report shows that among the total number of border crossings without documentation from various countries into

15390-418: The provisions were temporarily suspended. The U.S. Immigration Act of 1924 established the U.S. Border Patrol . The Mexican Revolution , caused at least partially by animosity toward foreign ownership of Mexican properties, began in 1910. The revolution increased the political instability in Mexico but did not significantly slow U.S. investment. It did reduce economic development within Mexico, however, and

15525-431: The residents of San Clemente during the process, as several bridges may have to be replaced with wider ones, and buildings may have to be demolished for the widening. North of downtown Los Angeles, the freeway is currently going widening, which includes the addition of HOV lanes in four phases. The first phase was the opening of a carpool lane between carpool lane between SR 170 and SR 14 in 2011. A flyover between

15660-561: The rest of the San Francisco Bay Area. Original plans also called for a loop Interstate with a directional suffix, I-5W. This route now roughly corresponds to I-580 from I-5 south of Tracy to Oakland, I-80 from Oakland to Vacaville, and I-505 from Vacaville to I-5 near Dunnigan. I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated, except I-35E and I-35W in Texas and Minnesota. Nevertheless, San Francisco

15795-417: The river that became segregated from either country by a cutoff, often caused by rapid accretion or avulsion of the alluvial channel), especially in the lower Rio Grande Valley. When these bancos are created, the International Boundary and Water Commission investigates if land previously belonging to the U.S. or Mexico is to be considered on the other side of the border. In all cases of these adjustments along

15930-466: The second-largest median in California after I-8 's In‑Ko‑Pah grade. In Siskiyou County , I-5 passes through Dunsmuir before intersecting SR 89 near Lake Siskiyou and entering the city of Mount Shasta . North of here, US 97 intersects I-5 in Weed , providing access to Klamath Falls, Oregon . The Interstate then continues to Yreka , intersecting SR 3 and SR 96 before crossing

16065-632: The section of highway between Castaic and Grapevine, through the Tejon Pass. The highway had its origins in the early 1910s, when a route was needed to connect Los Angeles to the Central Valley. Some believed that the only option was the route through the Mojave Desert and the Tehachapi Mountains, but a new route was discovered through the Tejon Pass. This route became known as the Ridge Route and saw almost constant planning, construction, and improvement from 1914 to 1970. The first road

16200-487: The section through Piru Canyon was moved to an entirely new alignment to make room for Pyramid Lake. The project was completed by 1970 and brought the Ridge Route to its current alignment. When the Interstate Highway System was created in 1956, there was discussion about which way to route the interstate through the San Joaquin Valley (Central Valley). Two proposals were considered. One was to convert

16335-424: The settlement of the international border, both of which specified that the middle of the Rio Grande was the border, irrespective of any alterations in the channels or banks. The Rio Grande shifted south between 1852 and 1868, with the most radical shift in the river occurring after a flood in 1864. By 1873 the moving river-center border had cut off approximately 2.4 square kilometers (590 acres) of Mexican territory in

16470-458: The spur into the Bay Area) connecting I-80 out of Vacaville to near Dunnigan, previously known as I-5W , was renamed I-505 . Interstate 580 running between I-5 and I-80 was also once designated 5W; what is now I-5 (the stretch that runs through Sacramento) had been originally designated I-5E . The term "Golden State Highway" was the popular name for US 99 through the length of California;

16605-417: The tourist aspect of the city, it is damaging to low-income residents that will no longer be able to afford the cost of living in Tijuana. Tijuana is home to many deportees from the U.S., many who have lost everything and do not have an income to rely on and are now in a new city in which they have to quickly adapt in order to survive. San Diego developers would bring many benefits to Tijuana, but deportees and

16740-581: The towns of Saugus and Newhall , and then crossed Newhall Pass (current route of SR 14, the Antelope Valley Freeway). In 1862, Beale's Cut was made in the construction of a toll wagon road. The 15 ft wide (4.6 m) by 60 ft deep (18 m) "slot" was dug with picks and shovels. That road would become part of the Midway Route. At the turn of the century, it was the most direct automobile route between Los Angeles and

16875-558: The two nations, "along the deepest channel" (also known as the thalweg )—a distance of 2,020 km (1,255 mi) to its mouth at the Gulf of Mexico. The Rio Grande frequently meanders along the Texas–Mexico border. As a result, the U.S. and Mexico have a treaty by which the Rio Grande is maintained as the border, with new cut-offs and islands being transferred to the other nation as necessary. The Boundary Treaty of 1970 between Mexico and

17010-535: The two nations, and provide for flood control and water sanitation. Once viewed as a model of international cooperation, in recent decades the IBWC has been heavily criticized as an institutional anachronism, by-passed by modern social, environmental and political issues. In particular, jurisdictional issues regarding water rights in the Rio Grande Valley have continued to cause tension between farmers along

17145-601: The western end of SR 905 , a route that connects with the Otay Mesa border crossing . I-5 then continues northward and joins the southern end of SR 75 , a highway connecting to Coronado via the Silver Strand . I-5 then enters Chula Vista , briefly leaving the San Diego city limits. It continues along the east side of San Diego Bay where it intersects with SR 54 and enters National City . From there, I-5 veers around Naval Base San Diego and reenters

17280-689: The works, but there are no near plans to construct it. The same plan includes a southerly extension of the HOV lanes to the San Bernardino Split interchange, but there are no near plans to construct that as well. Widening that segment of the freeway will require several overpass demolitions, as well a major widening through the area, as the freeway is too small to handle the widening. The widening would also result in hundreds of homes and commercial buildings to be demolished. Mexico%E2%80%93United States border The Mexico–United States border ( Spanish : frontera Estados Unidos–México )

17415-580: The world. The Mexico–U.S. border begins at the Initial Point of Boundary Between U.S. and Mexico , which is set one marine league (three nautical miles ) south of the southernmost point of San Diego Bay . The border then proceeds for 227 km (141 mi) in a straight line towards the confluence of the Colorado River and Gila River . The border continues southwards along the Colorado River for 39 km (24 mi), until it reaches

17550-400: Was completed in 1915. It was a slow, winding, two-lane road through the mountains with a speed limit of 15 mph (24 km/h) in some places. However, the need for improvements was realized soon after it was completed. The road was paved after World War I , and several blind turns were opened up ("daylighted"). Even with these improvements in the 1920s, it became clear that a new route

17685-415: Was created in 1924 with its primary mission to detect and prevent the illegal entry of immigrants into the U.S. Together with other law enforcement officers, the Border Patrol maintains the U.S.' borderlands—regulating the flow of legal immigration and goods while patrolling for undocumented migrants and trafficking of people and contraband. The present strategy to enforce migration along the U.S.–Mexico border

17820-402: Was flooded with 15 ft (4.6 m) of water. Caltrans began constructing this section during the 1960s and 1970s. The freeway was engineered below grade so it would be out of the view of offices and shops in downtown Sacramento. To achieve this, the site was excavated and the seeping water was pumped from the area. An intricate drainage system, water pump and retaining wall are used to protect

17955-442: Was needed to keep up with increasing demand. In 1927, plans were drawn up for a "Ridge Route Alternate", named as it was planned as an addition to the existing Ridge Route and not as a replacement. It opened in 1933 as a three-lane highway through the mountains. The middle or "suicide lane" was used as an overtaking lane for cars in both directions. This route was a great improvement, faster and 9.7 mi (15.6 km) shorter than

18090-483: Was originally designed to have three lanes in each direction. Due to high traffic demand, the freeway started undergoing major extensions and widening in the early 1990s in Orange County. Work from SR 91 north through the Los Angeles–Orange County line was completed in 2010. Reconstruction between the county line and Interstate 605 began in 2013 and was completed by early 2023. The original route went through

18225-519: Was part of New Spain . In the early 19th century, the U.S. bought the lands known as the Louisiana Purchase from France and began to expand steadily westward. After the 1803 Louisiana Purchase, the border between the U.S. and New Spain was not clearly defined. The border was established in the 1819 Adams–Onís Treaty between the U.S. and Spain, which specified northern and eastern borders. Mexico gained its independence from Spain, and

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