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The united states offered to buy California and new Mexico from Mexico before going to war in 1846 - False.
The U.S didn't offer anything before going to war in 1846.
In an effort to acquire California and New Mexico, President Polk dispatched John Slidell to Mexico City in November 1845. Mexico owed the United States $4.5 million but had been unable to pay due to political and economic instability. They deposed the president and put in place a new government that was in favor of going to war with the United States.
A treaty between Mexico and the United States was signed in February 1848, putting an end to the Mexican War and giving the United States control of a sizable area of the Southwest, including modern-day California.
The Gadsden Purchase, or Treaty, was an agreement between the United States and Mexico that was signed in 1854. It stated that the United States would pay Mexico $10 million in exchange for a 29,670 square mile portion of Mexico that would later become a part of Arizona and New Mexico.
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