| 1815
| Treaty of Ghent – End of War of 1812, Great Britain and US Discuss Boundary
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| 1817
| Rush-Bagot Agreement
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| 1818
| Convention of 1818, Some Boundaries Set, Joint Occupation
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| 1819
| Adams-Onis Treaty, Spain moves claims to 42nd Parallel
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| 1821
| Russia moves claims north to 51st Parallel
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| 1823
| Monroe Doctrine, Europe stays out of W. hemisphere unless they already claim the territory, no new claims
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| 1828
| Joint Occupation, PNW occupied by both Great Britain and US
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| 1840’s
| US and Britain argue of boundaries
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| 1844
| 54 40 or Fight, Polk defines Manifest Destiny, US destined to expand West
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| 1846
| Oregon Treaty, US Border established at 49th Parallel
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| 1853
| Washington Territory splits from Oregon due to large size. New territory encompasses Washington, Idaho and parts of Montana
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| 1859
| Pig War in San Juan Islands, US farmer shoots a British Pig, Which country has control?
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| 1863
| Idaho Territory splits, leaving Washington at its present shape and size
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| 1861-1865
| Civil War
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| 1867
| US Purchases Alaska from Russia ($7.2 million)
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| 1872
| San Juans become part of the US
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| 1880
| Most Native Americans are relocated to reservations
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| 1889
| November 11, Washington Become a state with Montana, North Dakota, South Dakota. Washington is the 42nd state to join the Union.
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