What problems and opportunities came from the United States’ territorial expansion from 1800-1861?

“What problems and opportunities came from the United States’ territorial expansion from 1800-1861? To answer this question, your response should explain how, when, and where the United States expanded its territory.”
Answer this question as thoroughly as possible (using the second part of the question to navigate you), no sources are to be used but the textbook “America’s History, Tenth Edition EBook (hereafter text), by Edwards, Hinderaker, Self, and Henretta”
Use footnotes when referring to the textbook per Chicago style