Category:1866 in Washington (state) by month

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English: This category applies to the geographic area that is now the U.S. state of Washington, but applies (in whole or part) to a period that predates Washington statehood. What is now the U.S. state of Washington was previously:
  • Native American territory from time immemorial
  • Part of the Oregon Country jointly occupied by the U.S. and the UK 1818-1846
  • Part of the U.S. Oregon Territory (defined by treaty June 15, 1846, organized August 14 1848)
  • The U.S. Washington Territory March 2, 1853 - November 11, 1889

Subcategories

This category has the following 2 subcategories, out of 2 total.