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Daily Archives: September 9, 2018

On This Day in History: California Became the 31st State

On This Day in History: California Became the 31st State

On this day in 1850, California officially became part of the United States. Today marks the day when California joined the United States as the 31st state. Aided by the discovery of gold within California’s borders, California became a state within two years of its acquisition from Mexico with the 1848 Treaty of Guadalupe Hidalgo.