How did westward expansion change america ?

As a result of the westward expansion, there were many conflicts with the Native Americans. ... With westward expansion, more states entered the Union. This led to fierce debates about the spread of slavery to these new lands. This eventually became a factor leading to the Civil War.

In the late fifteenth century, a major world power that established colonies in the era of old imperialism was france or germany or spain. their colonial activity was mainly limited to america or africa or asia.