1805 Meriwether Lewis and William Clark cross Idaho.
1809 First trading post in Idaho.
1848 Oregon Territory is established- includes Idaho.
1860 Franklin is founded.
1863 Idaho territory was established.
1880 Silver was found in Idaho.
1882 The Northern Pacific railroad connected Idaho to the Atlantic and Pacific Coasts.
1890 Idaho was admitted to the union as the 43rd state.
1936 The Sun Valley ski resort was created.