GEOGRAPHY OF SOUTHWEST UNITED STATES
BEFORE AND AFTER 1849
http://www.latinamericanstudies.org/mexican.htm
http://www.latinamericanstudies.org/mexican-war-maps.htm
http://workmall.com/wfb2001/mexico/mexico_history_the_mexican_american_war.html
At different times in history, California belonged to Mexico.
These sites contain many maps about the wars and the changes in
control of the territory of the American Southwest.