Arizona joined the union as the 48th state on 14 February 1912. It was ceded by Mexico to the United States by the Treaty of Guadalupe Hidalgo on 2 February 1848, and organised as the Arizona Territory in 1863.
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Arizona joined the union as the 48th state on 14 February 1912. It was ceded by Mexico to the United States by the Treaty of Guadalupe Hidalgo on 2 February 1848, and organised as the Arizona Territory in 1863.