Wyoming, state, United States: European Claims

European Claims

Portions of what is now Wyoming were at one time claimed by Spain, France, and England. The acquisition of the territory by the United States was completed through five major annexations—the Louisiana Purchase in 1803, the Treaty of 1819 with Spain, cession by the Republic of Texas in 1836 and partition from Texas after it was annexed in 1845, the Treaty of Guadalupe Hidalgo (1848) after the Mexican War, and the international agreement (1846) with Great Britain concerning the Columbia River country (see Oregon).

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