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IDIdaho History
Idaho at a glance
Idaho was admitted to the Union on 1890, making it the 43rd state. It joined the country 114 years after the Declaration of Independence. Its capital Boise has been the seat of state government for most of the state's history.
Native peoples
For thousands of years before European contact, Indigenous peoples lived across what is now Idaho. Multiple distinct cultures developed in response to the region's geography — coastal peoples, plains peoples, river-valley peoples, mountain peoples — each with their own languages, governance, and trade networks. European colonization disrupted these civilizations dramatically, often through disease, displacement, and forced removal. Today, Idaho's Native heritage is preserved in place names, tribal nations within state borders, and ongoing cultural practices.
Path to statehood
The path from European exploration to statehood typically took decades. Idaho was admitted to the Union on 1890, after meeting the requirements set by Congress: sufficient population, a written constitution, and the consent of Congress. The process from initial settlement to statehood was the 104th time the US expanded.
The modern era
Today Idaho has a population of 1 to 5 million and is one of the mid-sized states in the country. The capital is Boise; the largest city is Boise. Agriculture remains an important sector of the state economy. The political lean has shifted over time and now leans reliably Republican.
Key historical sites in Idaho
Idaho preserves its history through state parks, national monuments, historic districts, and museums. Battlefields, colonial towns, mission sites, Native American heritage areas, and Civil Rights landmarks (where applicable) anchor the state's heritage tourism. Visit the state's official tourism site for a current list.
Bordering states
Idaho shares borders with 6 other US states.
Learn US history through daily puzzles
Statedoku uses statehood era, Confederate or Union role, and admission years as recurring constraints. After a month of daily play, you'll know exactly when and how each state joined the Union.
Play today's puzzle →Common questions about Idaho history
When did Idaho become a state?
Idaho became a state in 1890, making it the 43rd state admitted to the Union.
Was Idaho part of the Confederacy?
No, Idaho was not part of the Confederacy.
Was Idaho part of the Louisiana Purchase?
No.
Did Spain or France colonize Idaho?
Idaho was primarily under British colonial influence.
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