Northern California has a smaller population of Mexicans than Southern California. This is mainly because since the US gains around 175,900 new citizens that come from Mexico annually, most of these residents reside in areas close to the Mexican border, which is where Southern California is. A Hispanic density map of the US is included in the link below.
California and New Mexico
Nevada was part of California during the Mexican War (1846-1848). And California was part of Mexico.
The Mojave is the desert of California and it is located in the southeastern part of the state, along the Mexican border.
California and Texas
Was part of the Mexican War
San Diego is in the southernmost part of California, on the border with Mexico. It's also on the coast.Southern California, between Los Angeles and the Mexican border.
Mexico gave up its claims to California as a result of the Mexican War.
California was part of the northern portion of Mexico that was added to the US as a result of the Mexican-American War.
The current State of California was part of the Mexican Department of Alta California, which was part of the land ceded to the United States by Mexico according to the Treaty of Guadalupe-Hidalgo, signed on 2 February 1848 and ending the Mexican-American war.
California was a part of Alta California, a region of Mexico that the US acquired as a result of the Mexican-American War. This area wasn't annexed but was ceded.
Baja California is a peninsula that extends along the Pacific coast south of the US state of California. It remained part of Mexico after the Mexican Cession of 1848 that gave most of the region (Alta California) to the US following the Mexican-American War. It consists of two Mexican states, Baja California (capital Mexicali) and Baja California Sur in the south (capital La Paz).Baja California is separated from the mainland by the Gulf of California (sometimes referred to as the Sea of Cortes). It includes the resort Cabo San Lucas at the tip of the peninsula, where it crosses the Tropic of Cancer.
California was not part of the Louisiana Purchase. It was acquired by the United States through the Treaty of Guadalupe Hidalgo in 1848 after the Mexican-American War.