What government rule allowed states to buy they had claimed to the west?

Answer 1

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Answer 2

The government rule that allowed states to buy the land they had claimed to the west is known as the "Mexican Cession." This was a provision of the Treaty of Guadalupe Hidalgo, which ended the Mexican-American War in 1848. It allowed the United States to purchase the Mexican territories of California, Nevada, Utah, Arizona, New Mexico, and parts of Colorado and Wyoming for $15 million.