Hey there,
Im afraid I cannot answer your question as much as I'd like to. You ask for evidence from a text that we cannot see. Perhaps the answer you are looking for is in the reading you have or in a textbook.
Have a great day!
xoxo, Ash
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.
Https://www.quora.com/What-are-the-best-examples-from-history-of-might-makes-right this link can help you
Increasing the amount of well nourished workers for the factories during the industrial revolution