<span>This is of course somewhat of a subjective question, but in general most would agree that in general expansion was not justifiable since the Mexicans and Natives were doing nothing to provoke the US. One could argue it was justifiable since Americans needed more land. </span>
They quickly went from allies to enemies. There was heavy mistrust between each other based on the ideologies of communism and capitalism.
Answer:
Maybe some 300,000 or 400,000. Covering an average of 15 to 20 miles.
Explanation:
