1803: The US buys
the Louisiana territories, which includes parts of
and Clark enter what is now Idaho at Lemhi pass
and cross the Bitterroot Mountains with help from
the Nez Perce Indians.
1810: Fort Henry is built. It is the first fur post
west of the Rocky Mountains.
1822: William Ashley organizes the Rocky Mountain
1834: Forts Laramie, Boise and Hall are created
as supply posts serving westward-bound explorers.
1836: Henry H. Spalding creates Idaho’s first
school, first irrigation system and plants first
1843: First Oregon trail wagons cross Idaho.
1848-1853: Cataldo Mission, Idaho's oldest building,
is constructed at Coeur D' Alene by Catholic Missionaries.
is founded as the first town in Idaho by Mormons
who thought they were in Utah Territory.
Lincoln signs an act creating the Idaho Territory
from parts of the Washington and Dakota Territories
1864: Boise is incorporated as a city and becomes
the capital of the Idaho Territory.
1890: President Benjamin Harrison admits Idaho as
the 43rd state.
1905: The completion of Milner Dam on the Snake
River gives rise to many agricultural communities
in southern Idaho such as Nampa and Twin Falls.
1920: State Capitol building is completed
immigrants (French and Spanish descent) settle
in Boise, making it one of the largest centers
of Basque culture in America.
1936: Sun Valley Ski resort opens.