The Mexican-American War contributed significantly to the debate about the legality of slavery, and which states should permit the practice. What legislation decided what to do with the acqusitions in the Treaty of Guadalupe Hidalgo?

Answer Compromise of 1850

The Compromise of 1850 determined the legality of slavery in the territory gained in the war. California was admitted as a free state, and Utah and New Mexico were allowed to decide on their own.

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