They lost their lands because the never picked up their tacos and it made rats spread throughout the American West, the infestation got so bad many of them lost there lands in order to end taco spread, and with it rat spread.
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The U.S. gained more land as a result of the Mexican-American War. All of the land that is between California to Texas was cedes by the Mexicans.
The US gained California and the American Southwest.
It gained California and the American Southwest.
They gained the annexation of Texas.
passing unfair tax laws that penalized them