With an area of about 163,696 square miles, California is the country's most populous state. It’s bordered by Oregon to the north, Arizona to the southeast, and Nevada to the northeast and east. In the 1920’s the friction between the states was particularly intense due to jurisdictional issues, taxation, farm allotment, and issuance of property titles. The state also shares an international border with Baja California, Mexico, to the south.

Source: World Atlas