Describe the effects of American expansion across the Southwest from the 1820s through the 1840s.

This history paper has to be six pages. The first five-pages is related to the topic that I give you, in the last page has to be the reference, which is where you cite the information from along with the authors name, date, and also the format has to be corrected.
The papers topic is to describe the effects of American expansion across the Southwest from the 1820s through the 1840s. Describe expansions impact on the Indians of the Southwest, the Mexicans, and Americans in both the North and the South who were interested in the post-1848 acquisitions. I would like you to show me why does American expansion and their effect as well. In addition, what events happen during the 1820s through the 1840s, and mention the main characters appear at this time.This paper has to be more than five paragraph
This history paper that I have to turn it in in the turnitin.com. Over there my original report has to be lower than 15%, or I gonna fail, please be careful to cite the information.