What was the importance of the Mexican Cession?

With the Treaty of Guadalupe Hidalgo, Mexico ceded over 525,000 square miles of territory to the United States in exchange for $15 million and the assumption of Mexican debts to American citizens, which reopened the slavery issue.

Explanation:

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what started the norman conquest?

profound political, administrative, and social changes in the british isles. last line of my information: )