OREGON & WASHINGTON TERRITORIES 1853-58
| 1853 | Construction of the Cataldo Mission completed. Washington Territory established. Idaho divided between Washington and Oregon. |
| 1854 | Twenty-one emigrants led by Alexander Ward massacred in Boise Valley by the Snake River Indians. This event leads to the closing of Fort Boise the next summer and Fort Hall in 1856. |
| 1855 | Mormon missionaries establish Fort Lemhi, reclaim first land by irrigation in Idaho. |
| 1857 | Oregon's eastern boundary (Idaho's western boundary) established by Oregon constitutional convention. |
| 1858 | Bannock Indians attacked the Mormons at Fort Lemhi, killing two and driving the remaining back to Utah. |
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