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 Guadelupe Hidalgo on 2 February 1848.
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In 1880 the population of the United States was 50,155,783.U.S. Census Bureau
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- 1788 New York became the 11th state to ratify the United States Constitution
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