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July 10, 1890 is when Wyoming joined the union

Most of land that is now part of Wyoming was acquired by the United States with the Louisiana Purchase April 30, 1803. The northwestern part of what is now Wyoming was originally part of the "Oregon Country" which was claimed by both the United States and Britain. The Oregon Treaty, signed on June 15, 1846 in Washington, D.C., gave control of the part that is now in Wyoming to the United States. What is now southwestern Wyoming became nominally a part of the Spanish, and later Mexican, territory of Alta California, until it was ceded to the United States February 2, 1848 at the end of the Mexican-American war. It could be said that Wyoming "joined" the United States in 1803, 1846, and 1848, but the STATE of Wyoming didn't join the union until 1890; the United States admitted Wyoming into the Union as the 44th state on July 10, 1890.

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14y ago

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