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65-675: The Priest River complex in northern Idaho , northeastern Washington , and southeastern British Columbia is a series of early and middle Eocene metamorphic core complexes that extend southward from the south-central Canadian Cordillera to the Columbia Plateau and southeastward to the Idaho Batholith . The east side of the Priest River complex on forms the west wall of the Purcell Trench. The Purcell Trench

130-635: A compromise was reached in the ongoing negotiations in Washington, D.C., and the matter was then settled by the Polk administration (to the surprise of its own party's hardliners) to avoid a two-war situation, and another war with the formidable military strength of Great Britain. In early June 1846 the British offered to negotiate the boundaries between the United States and British North America in

195-410: A difficult start as a territory, including the chaotic transfer of the territorial capital from Lewiston to Boise , disenfranchisement of Mormon polygamists upheld by the U.S. Supreme Court in 1890, and a federal attempt to split the territory between Washington Territory, which gained statehood in 1889, a year before Idaho, and the state of Nevada which had been a state since 1864. Idaho

260-721: A result of the Fraser Canyon Gold Rush and fears of the re-asserted American expansionist intentions. The two British colonies were amalgamated in 1866 as the Colony of British Columbia . When the Colony of British Columbia joined Canada in 1871, the 49th parallel and marine boundaries established by the Oregon Treaty became the Canada–US border . In order to ensure that Britain retained all of Vancouver Island and

325-848: Is Borah Peak , 12,662 ft (3,859 m), in the Lost River Range north of Mackay . Idaho's lowest point, 710 ft (216 m), is in Lewiston , where the Clearwater River joins the Snake River and continues into Washington. The Sawtooth Range is often considered Idaho's most famous mountain range. Other mountain ranges in Idaho include the Bitterroot Range , the White Cloud Mountains ,

390-789: Is collected by the Idaho State Tax Commission . Oregon Treaty The Oregon Treaty was a treaty between the United Kingdom and the United States that was signed on June 15, 1846, in Washington, D.C. The treaty brought an end to the Oregon boundary dispute by settling competing American and British claims to the Oregon Country ; the area had been jointly occupied by both Britain and

455-426: Is divided into three segments. The southern segment, which extends from Lake Coeur d'Alene through Sandpoint to north of Colburn , contains compelling evidence of the east-dipping Purcell Trench normal fault. The middle segment, which extends from Colburn and Naples , is unfaulted. The northern segment from Naples to Kootenay Lake also contains evidence of a major eastdipping normal fault. The width and depth of

520-453: Is least prominent in the state's eastern part where the precipitation patterns are often reversed, with wetter summers and drier winters, and seasonal temperature differences are more extreme, showing a more semi-arid continental climate . Idaho can be hot, although extended periods over 98 °F (37 °C) are rare, except for the lowest point in elevation, Lewiston , which correspondingly sees little snow. Hot summer days are tempered by

585-555: Is of European descent. Most of Idaho's white residents trace their ancestry to the United Kingdom, Germany, Ireland, France, Italy, or Poland. There are also small numbers of Native Americans, Asians, and African Americans in the state. In 2018, the top countries of origin for Idaho's immigrants were Mexico , Canada , the Philippines , China and Germany . There are five federally recognized Native American tribes in

650-839: Is the Snake River, a major tributary of the Columbia River. The Snake River flows from Yellowstone in northwestern Wyoming through the Snake River Plain in southern Idaho before turning north, leaving the state at Lewiston before joining the Columbia in Kennewick . Other major rivers are the Clark Fork / Pend Oreille River , the Spokane River , and, many major tributaries of the Snake River, including

715-400: Is the country's largest Department of Energy facility. Idaho's agricultural sector supplies many products, but the state is best known for its potato crop , which comprises around one-third of the nationwide yield. The official state nickname is the "Gem State". The name's origin remains a mystery. In the early 1860s, when the U.S. Congress was considering organizing a new territory in

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780-597: Is the state's predominant language. Minority languages include Spanish and various Native American languages . Idaho's gross state product was $ 118.8 billion in 2023 and the state's per capita income that year was estimated to be $ 59,035. As of 2016, the state's total employment was 562,282, and the total employer establishments were 45,826. Important industries in Idaho are food processing, lumber and wood products, machinery, chemical products, paper products, electronics manufacturing, silver and other mining, and tourism. The world's largest factory for barrel cheese,

845-474: The 13th-least populous and the seventh-least densely populated of the 50 U.S. states . For thousands of years, and prior to European colonization, Idaho had been inhabited by native peoples . In the early 19th century, Idaho was considered part of the Oregon Country , an area which was disputed between the U.S. and the British Empire . Idaho officially became a U.S. territory with the signing of

910-890: The Clearwater River , the Salmon River , the Boise River , and the Payette River . The Salmon River empties into the Snake in Hells Canyon and forms the southern boundary of Nez Perce County on its north shore, of which Lewiston is the county seat. The Port of Lewiston , at the confluence of the Clearwater and the Snake Rivers is the farthest inland seaport on the West Coast at 465  river miles from

975-496: The Hudson's Bay Company . (Also included in the region was the southern portion of another fur district, New Caledonia .) The treaty provided for joint control of that land for ten years. Both countries could claim land and both were guaranteed free navigation throughout. Joint control steadily grew less tolerable for both sides. After a British minister rejected the offer of U.S. Presidents James K. Polk and John Tyler to settle

1040-641: The Lost River Range , the Clearwater Mountains , and the Salmon River Mountains . Salmon-Challis National Forest is located in the east central sections of the state, with Salmon National Forest to the north and Challis National Forest to the south. The forest is in an area known as the Idaho Cobalt Belt, which consists of a 34 miles (55 km) long geological formation of sedimentary rock that contains some of

1105-942: The Oregon Trail , and many settlers chose to settle the area rather than risking the treacherous route through the Blue Mountains and the Cascade Range to the west. The western region of the plain is known as the Treasure Valley , bound between the Owyhee Mountains to the southwest and the Boise Mountains to the northeast. The central region of the Snake River Plain is known as the Magic Valley . Idaho's highest point

1170-691: The Oregon Treaty of 1846 , but a separate Idaho Territory was not organized until 1863, instead being included for periods in Oregon Territory and Washington Territory . The state was eventually admitted to the Union on July 3, 1890, becoming the 43rd state . Forming part of the Pacific Northwest (and the associated Cascadia bioregion ), Idaho is divided into several distinct geographic and climatic regions. The state's north,

1235-477: The Rocky Mountains , the name "Idaho" was suggested by George M. Willing , a politician posing as an unrecognized delegate from the unofficial Jefferson Territory . Willing claimed that the name was derived from a Shoshone term meaning "the sun comes from the mountains" or "gem of the mountains", but it was revealed later that there was no such term and Willing claimed that he had been inspired to coin

1300-483: The Rocky Mountains . The United States Forest Service holds about 38% of Idaho's land, the highest proportion of any state. Industries significant for the state economy include manufacturing, agriculture, mining, forestry, and tourism. Several science and technology firms are either headquartered in Idaho or have factories there, and the state also contains the Idaho National Laboratory , which

1365-466: The "whole British press" greeted the news of the Senate's ratification of Lord Aberdeen's proposed treaty with "a sigh of relief" and "universal satisfaction" comes close to being accurate. The Whig, Tory, and independent newspapers agreed in their expressions of satisfaction with the treaty. Though a few newspapers had at least mild reservations, completely absent was the strong condemnation that had greeted

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1430-634: The Association of Religion Data Archives revealed Mormons remained the largest with 462,069, followed by Catholics (203,790), and non-denominational Protestantism (98,996). In 2022, the Public Religion Research Institute's American Values Survey estimated altogether, 72% of the population was Christian, 26% were religiously unaffiliated, and 3% were New Agers. Of its Christian population, 37% were Protestant, 24% Mormon, 9% Catholic, and 2% Jehovah's Witnesses . English

1495-781: The Boise City-Nampa, ID Metropolitan Statistical Area) is Idaho's largest. Other metropolitan areas, in order of size, are Coeur d'Alene , Idaho Falls , Pocatello and Lewiston . According to HUD 's 2022 Annual Homeless Assessment Report , there were an estimated 1,998 homeless people in Idaho. According to the 2017 American Community Survey , 12.2% of Idaho's population was of Hispanic or Latino origin, of any race: Mexican (10.6%), Puerto Rican (0.2%), Cuban (0.1%), and other Hispanic or Latino origin (1.3%). The five largest ancestry groups were: German (17.5%), English (16.4%), Irish (9.3%), American (8.1%), and Scottish (3.2%). The majority of Idaho's population

1560-426: The British hoped this vote would pass the Senate. On June 12, the Senate voted 38–12 recommending that President Polk accept British proposals to negotiate this boundary. Votes in favor included 18 Democrats and 20 Whigs, whereas 11 Democrats and one Whig voted against. Three Democrats and three Whigs abstained. The treaty was negotiated by US Secretary of State James Buchanan and Richard Pakenham , British envoy to

1625-533: The North West Company in 1813, after which the post was abandoned. The first organized non-indigenous communities within the present borders of Idaho were established by Mormon pioneers in 1860. The first permanent, substantial incorporated community was Lewiston, in 1861. Early in its history, Idaho saw a large influx of Chinese immigrants , who by 1870 made up about 28.5% of the territory's population. Idaho achieved statehood in 1890, following

1690-579: The Pacific at Astoria, Oregon . The vast majority of Idaho's population lives in the Snake River Plain, a valley running from across the entirety of southern Idaho from east to west. The valley contains the major cities of Boise , Meridian , Nampa , Caldwell , Twin Falls , Idaho Falls , and Pocatello . The plain served as an easy pass through the Rocky Mountains for westward-bound settlers on

1755-666: The Puget Sound region entirely, as the Americans were busy elsewhere with the Civil War. The San Juans dispute was not resolved until 1872 when, pursuant to the 1871 Treaty of Washington , an arbitrator ( William I, German Emperor ) chose the American-preferred marine boundary via Haro Strait , to the west of the islands, over the British preference for Rosario Strait which lay to their east. The treaty also had

1820-534: The U.S. since the Treaty of 1818 . The Treaty of 1818 set the boundary between the United States and British North America along the 49th parallel of north latitude from Minnesota to the "Stony Mountains" (now known as the Rocky Mountains ). The region west of those mountains was known to the Americans as the Oregon Country and to the British as the Columbia Department or Columbia District of

1885-482: The United States. Foreign Secretary Earl of Aberdeen was responsible for it in Parliament. The treaty was signed on June 15, 1846, ending the joint occupation and making Oregonians south of the 49th parallel American citizens, with those north of it becoming British. The Oregon Treaty set the border between the U.S. and British North America at the 49th parallel with the exception of Vancouver Island , which

1950-601: The area that became the U.S. state. Humans may have been present in the Idaho area as long as 14,500 years ago. Excavations at Wilson Butte Cave near Twin Falls in 1959 revealed evidence of human activity, including arrowheads, that rank among the oldest dated artifacts in North America. American Indian peoples predominant in the area included the Nez Percé in the north and the Northern and Western Shoshone in

2015-465: The areas that are south of the ice sheet. An early presence of French-Canadian trappers is visible in names and toponyms : Nez Percé, Cœur d'Alène, Boisé, Payette . Some of these names appeared prior to the Lewis and Clark and Astorian expeditions, which included significant numbers of French and Métis guides recruited for their familiarity with the terrain. Idaho, as part of the Oregon Country ,

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2080-598: The boundary at the 49th parallel north , American expansionists called for the annexation of the entire region up to Parallel 54°40′ north , the southern limit of Russian America as established by parallel treaties between the Russian Empire and the United States (1824) and Britain (1825). However, after the outbreak of the Mexican–American War in April 1846 diverted U.S. attention and military resources,

2145-652: The commission decided in favor of the United States, awarding the San Juan Islands to the U.S. The treaty states that the border in the Strait of Juan de Fuca would follow “the middle of the channel which separates the continent from Vancouver's Island.” It did not, however, specify which of several possible channels was intended, giving rise to ownership disputes over the San Juan Islands beginning in 1859. Other provisions included: Ambiguities in

2210-419: The continental United States. Idaho is a Rocky Mountain state with abundant natural resources and scenic areas. The state has snow-capped mountain ranges, rapids, vast lakes and steep canyons. The waters of the Snake River run through Hells Canyon , the deepest gorge in the United States. Shoshone Falls falls down cliffs from a height greater than Niagara Falls . By far, the most important river in Idaho

2275-504: The creation of the Idaho Territory in 1863, parts of present-day Idaho were included in the Oregon , Washington , and Dakota Territories. The new Idaho territory included present-day Idaho, Montana , and most of Wyoming . The Lewis and Clark expedition crossed Idaho in 1805 on the way to the Pacific, and in 1806, on the return trip, largely following the Clearwater River in both directions. The first non-indigenous settlement

2340-570: The east, Nevada and Utah to the south, and Washington and Oregon to the west; the state shares a small portion of the Canada–United States border to the north with the Canadian province of British Columbia . Idaho's state capital and largest city is Boise . With an area of 83,569 square miles (216,440 km ), Idaho is the 14th-largest state by land area. The state has a population of approximately 2.0 million people, it ranks as

2405-502: The first people might not have come to North America by land, as previously theorized. On the contrary, they probably came through the water, using a Pacific coastal route. The most parsimonious explanation we think is that people came down the Pacific Coast, and as they encountered the mouth of the Columbia River, they essentially found an off-ramp from this coastal migration and also found their first viable interior route to

2470-580: The inner valley of the Kootenai River in Boundary County, Idaho , when the first glaciers arrived is unknown. The valley floor higher than the present outlet from the west arm of Kootenay Lake near Nelson, British Columbia , which is about 1,730 feet (530 m) above sea level (asl); it could have been as much as 2,000 feet (610 m) asl. There were at least three glacial invasions with their associated receding ice fronts. As of 1953 it

2535-588: The largest cobalt deposits in the U.S. Idaho has two time zones , with the dividing line approximately midway between Canada and Nevada . Southern Idaho, including the Boise metropolitan area , Idaho Falls , Pocatello , and Twin Falls , are in the Mountain Time Zone . A legislative error ( 15 U.S.C. ch. 6 §264) theoretically placed this region in the Central Time Zone , but this

2600-548: The largest single economic center (over 25% of the state's total revenue) within the state and are greater than agriculture, forestry and mining combined. During the COVID-19 pandemic , Idaho enacted statewide crisis standards of care as COVID-19 patients overwhelmed hospitals. The state had one of the lowest vaccination rates in the country as of mid-October 2021. Idaho shares a border with six U.S. states and one Canadian province. The states of Washington and Oregon are to

2665-518: The last census of 58,884 (111,131 births minus 52,247 deaths) and an increase due to net migration of 75,795 people into the state. There are large numbers of Americans of English and German ancestry in Idaho. Immigration from outside the United States resulted in a net increase of 14,522 people, and migration within the country produced a net increase of 61,273 people. According to the American Immigration Council, in 2018,

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2730-433: The low relative humidity and cooler evenings during summer months since, for most of the state, the highest diurnal difference in temperature is often in the summer. Winters can be cold, although extended periods of bitter cold weather below zero are unusual. Idaho's all-time highest temperature of 118 °F (48 °C) was recorded at Orofino on July 28, 1934; the all-time lowest temperature of −60 °F (−51 °C)

2795-477: The name when he met a little girl named Ida . Since the name appeared to be fabricated, the U.S. Congress ultimately decided to name the area Colorado Territory instead when it was created in February 1861, but by the time this decision was made, the town of Idaho Springs, Colorado had already been named after Willing's proposal. The same year Congress created Colorado Territory, a county called Idaho County

2860-638: The raw product for processed cheese , is in Gooding, Idaho . It has a capacity of 120,000 metric tons per year of barrel cheese and belongs to the Glanbia group. Hewlett-Packard has operated a large plant in Boise since the 1970s, which is devoted primarily to LaserJet printers production. Idaho has a state gambling lottery , which contributed $ 333.5 million in payments to all Idaho public schools and Idaho higher education from 1990 to 2006. Tax

2925-541: The region west of the Rockies. Some US senators such as Charles Gordon Atherton and Benning Wentworth Jenness were combative and were in favor of rejecting British proposals to negotiate. However others, such as both Alabama senators ( Arthur P. Bagby and Dixon Hall Lewis ) as well as both Massachusetts senators ( Daniel Webster and John Davis ) were in favor of accepting British proposals. The Senate agreed that they would vote on whether or not to recommend President Polk accept British offers to negotiate. Watching closely,

2990-413: The relatively isolated Idaho Panhandle , is closely linked with Eastern Washington , with which it shares the Pacific Time Zone —the rest of the state uses the Mountain Time Zone . The state's south includes the Snake River Plain (which has most of the population and agricultural land), and the southeast incorporates part of the Great Basin . Idaho is quite mountainous and contains several stretches of

3055-415: The self-identified religious affiliations of Idahoans over the age of 18 in 2008 and 2014 were: According to the Association of Religion Data Archives , the largest denominations by number of members in 2010 were The Church of Jesus Christ of Latter-day Saints with 409,265; the Catholic Church with 123,400; the non-denominational Protestants with 62,637; and the Assemblies of God with 22,183. In 2020,

3120-494: The south. A Late Upper Paleolithic site was identified at Cooper's Ferry in western Idaho near the town of Cottonwood by archaeologists in 2019. Based on evidence found at the site, first people lived in this area 15,300 to 16,600 years ago, predating the Beringia land bridge by about a thousand years. The discoverers emphasized that they possess similarities with tools and artifacts discovered in Japan that date from 16,000 to 13,000 years ago. The discovery also showed that

3185-448: The southern Gulf Islands, it was agreed that the border would swing south around that area. Ownership of several channel islands, including the San Juan Islands remained in dispute. A bloodless confrontation known as the Pig War erupted in 1859 over ownership of the San Juans, which was not resolved until 1872. Ultimately, arbitration began with German Emperor Wilhelm I as head of a three-man arbitration commission. On October 21, 1872,

3250-450: The state. These tribes include the Shoshone-Bannock, the Shoshone-Paiute, the Coeur d’Alene, the Kootenai and the Nez Perce. Note: Births in table don't add up, because Hispanics are counted both by their ethnicity and by their race, giving a higher overall number. Religious self-identification, per Public Religion Research Institute 's 2022 American Values Survey According to the Pew Research Center on Religion & Public Life,

3315-401: The top countries of origin for Idaho's immigrants were Mexico, Canada, the Philippines, China and Germany. Idaho's population increased by 17.3% from 2010 to 2020, the second fastest rate of growth of any state that decade. Nampa, about 20 miles (30 km) west of downtown Boise, became the state's second largest city in the late 1990s, passing Pocatello and Idaho Falls. Nampa's population

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3380-407: The unintended consequence of putting what became Point Roberts, Washington on the "wrong" side of the border. A peninsula, jutting south from Canada into Boundary Bay , was made by the agreement, as land south of the 49th parallel, a separate fragment of the United States. According to American historian Thomas C. McClintock, the British public welcomed the treaty: Frederick Merk's statement that

3445-409: The valley. This allowed hundreds of feet of fine-grained, silty sediment to deposit in the Purcell Trench and create the flat terraces seen today near Bonners Ferry. Idaho Idaho ( / ˈ aɪ d ə h oʊ / EYE -də-hoh ) is a landlocked state in the Pacific Northwest and Mountain West subregions of the Western United States . It borders Montana and Wyoming to

3510-453: The west, Nevada and Utah are to the south, and Montana and Wyoming are to the east. Idaho also shares a short border with the Canadian province of British Columbia to the north. The landscape is rugged, with some of the largest unspoiled natural areas in the United States. For example, at 2.3 million acres (930,000 ha), the Frank Church-River of No Return Wilderness Area is the largest contiguous area of protected wilderness in

3575-470: The winter when cloud cover, humidity , and precipitation are at their maximum extent. This influence has a moderating effect in the winter where temperatures are not as low as would otherwise be expected for a northern state with predominantly high elevations. In the panhandle, moist air masses from the coast are released as precipitation over the North Central Rockies forests , creating the North American inland temperate rainforest . The maritime influence

3640-438: The wording of the Oregon Treaty regarding the route of the boundary, which was to follow "the deepest channel" out to the Strait of Juan de Fuca and beyond to the open ocean, resulted in the Pig War , another boundary dispute in 1859 over the San Juan Islands . The dispute was peacefully resolved after a decade of confrontation and military bluster during which the local British authorities consistently lobbied London to seize back

3705-414: Was Kullyspell House , established on the shore of Lake Pend Oreille in 1809 by David Thompson of the North West Company for fur trading. In 1812 Donald Mackenzie , working for the Pacific Fur Company at the time, established a post on the lower Clearwater River near present-day Lewiston. This post, known as "MacKenzie's Post" or "Clearwater", operated until the Pacific Fur Company was bought out by

3770-417: Was claimed by both the United States and Great Britain until the United States gained undisputed jurisdiction in 1846. From 1843 to 1859, present-day Idaho was under the de facto jurisdiction of the Provisional Government of Oregon . When Oregon became a state in 1859, what is now Idaho was situated in what remained of the original Oregon Territory, designated as the Washington Territory. Between 1849 and

3835-437: Was corrected with a 2007 amendment. Areas north of the Salmon River , including Coeur d'Alene , Moscow , Lewiston , and Sandpoint , are in the Pacific Time Zone , which contains less than a quarter of the state's population and land area. Idaho's climate varies widely. Although the state's western border is about 330 miles (530 km) from the Pacific Ocean, the maritime influence is still felt in Idaho; especially, in

3900-412: Was created in eastern Washington Territory . The county was named after a steamship named Idaho , which was launched on the Columbia River in 1860. It is unclear whether the steamship was named before or after Willing's claim was revealed. Regardless, part of Washington Territory, including Idaho County, was used to create Idaho Territory in 1863. Idaho Territory would later change its boundaries to

3965-409: Was not possible to differentiate the effects of the earlier Illinoian and earlier glacial periods below Bonners Ferry from those of the Wisconsin glaciation period. It appears doubtful that the pre-Wisconsin ice sheets of the Cordilleran ice sheet reach to the valley of the Pend Oreille River . Each time the glaciers began to retreat, they blocked the northward drainage of meltwater and flooded

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4030-472: Was one of the hardest hit of the Pacific Northwest states during the Great Depression . Prices plummeted for Idaho's major crops: in 1932 a bushel of potatoes brought only ten cents compared to 1919 for $ 1.51, while Idaho farmers saw their annual income of $ 686 in 1929 drop to $ 250 by 1932. In recent years, Idaho has expanded its commercial base as a tourism and agricultural state to include science and technology industries. Science and technology have become

4095-413: Was recorded at Island Park Dam on January 18, 1943. As of 2018: The United States Census Bureau determined Idaho's population was 1,900,923 on July 1, 2021, a 21% increase since the 2010 U.S. census . Idaho had an estimated population of 1,754,208 in 2018, which was an increase of 37,265, from the prior year and an increase of 186,626, or 11.91%, since 2010. This included a natural increase since

4160-399: Was retained in its entirety by the British. Vancouver Island, with all coastal islands, was constituted as the Colony of Vancouver Island in 1849. The U.S. portion of the region was organized as Oregon Territory on August 15, 1848, with Washington Territory being formed from it in 1853. The British portion remained unorganized until 1858, when the Colony of British Columbia was set up as

4225-489: Was under 29,000 in 1990 and grew to over 81,000 by 2010. Located between Nampa and Boise, Meridian also experienced high growth, from fewer than 10,000 residents in 1990 to more than 75,000 in 2010 and is now Idaho's third largest city. Growth of 5% or more over the same period has also been observed in Caldwell , Coeur d'Alene , Post Falls , and Twin Falls. From 1990 to 2010, Idaho's population increased by over 560,000 (55%). The Boise metropolitan area (officially known as

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