The land that is now California was not always part of the United States. Many years ago, it used to be a part of Mexico.
The area on the map that is yellow represents the land that used to belong to Mexico.
In 1846 Mexico and the United States fought a war over who would get to keep the states now known as California, Arizona, New Mexico, Nevada, Texas, and Utah. It was called the Mexican-American war.
In California, it was called the Bear Flag Revolt.
Credits:
Created with images by Håkan Dahlström - "California Republic" • Free Grunge Textures - www.freestock.ca - "California Grunge Flag" • Calsidyrose - "California Historical Map"