is a state located in the western Pacific region of the United States and was the 31st admitted to the Union. It is the most populous state of the United States. It is bordered by Oregon to the north, Nevada to the east, and Arizona to the southeast in the United States, as well as Baja California in Mexico to the south. California's capital city is Sacramento, with the four largest cities being Los Angeles, San Diego, San Jose, and San Francisco. California is known for its diverse climate and geography, as well as ethnically diverse population. The state has 58 counties.

Before becoming a part of the United States, Alta California was colonized by the Spanish Empire in 1769. After Mexican independence in 1821, Alta California remained as part of Mexico until 1846, when it was the independent California Republic for one brief week. Following the conclusion of the Mexican-American war of 1848, California was annexed by the United States and was admitted to the Union as the thirty-first state on September 9, 1850.