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Washington became a state on 11 November 1889. It had previously been the Washington Territory, split from the Oregon Territory in 1848.

The Oregon Territory was ceded to the US by Great Britain under the Oregon Treaty of 1846, which also established boundaries between the US and the British colonies of British Columbia and Vancouver Island. Previously the territories were nominally under joint administration.
1889
Washington become a state on November 11, 1889 as the 42nd state.


Washington was admitted into the Union on November 11, 1889 becoming the 42nd state to join the Union.

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7y ago

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More answers

Seattle never became a US State. It is a City within the US State of Washington which received statehood on 11 November 1889.

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Wiki User

13y ago
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November 11, 1889

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Wiki User

15y ago
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Washington DC has never been a state.

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Wiki User

13y ago
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What state is Washington DC in?

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Anonymous

5y ago
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Q: When did Washington State become a state?
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