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Answer:
1. All you have to do is sum up how each territory gain changed the border.
2. The United States gained riches, like gold, they gained the power, the reputation, and even the authority that comes with gaining such a large territory.
Explanation:
As you can see on the second map, California and other states in the west were rich in gold, coal, and oil.
By gaining the land, they gained those riches.