Answer:
Since Indian tribes living there appeared to be the main obstacle to westward expansion, white settlers petitioned the federal government to remove them. ... Under this kind of pressure, Native American tribes—specifically the Creek, Cherokee, Chickasaw, and Choctaw—realized that they could not defeat the Americans in war.
Explanation:
In simpler terms, the Native American tribes did not want to give up their land and America wanted to keep expanding ultimately into Native American land.
Many historians believed thag the harsh terms found against germany in the treaty of versailles helped lead to WWII
The U.S. helped Japan rebuild economically after WWII and has maintained a peaceful relationship. The U.S. occupied Japan for four decades to make sure they did not rebuild their military.
Hope this helps