Ineed starting my paper. i just need with my introduction to write the rest. the prompt is how and why did the united states expand? . i'll give brainliest.

This is a good source to look at, I used it for my essay on Westward Expansion last year.

"Westward Expansion and Bleeding Kansas." The Civil War, Primary Source Media, 1999. American Journey. U.S. History in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/EJ2151000178/UHIC?u=mlin_c_algonhs&xid=5fc824b2. Accessed 8 Apr. 2017.

Important Points To Discuss In Intro:

 The Westward Expansion began in 1803 when Thomas Jefferson figured that expanding the country's territories would be absolutely crucial in order to allow the country to prosper. 

The westward expansion ended up making slavery an issue that created a ton of racial tension.

The Louisiana Purchase started at the Mississippi River and reached the Rocky Mountains. 

^^ It doubled the size of the U.S

Describe manifest destiny - the idea that America was supposed to reach from one coast to another

Also, if you can, describe Eli Whitney's cotton gin invention. 

⇒ Connect all of these points to the thesis statement written below.

Possible Thesis Statement: The United States decided to expand due to the Louisiana Purchase, the belief of "manifest destiny" and the need to ship new innovations and products across the country with ease.