Why did many americans believe imperialism was wrong?
a. because it destroyed native cultures.
b. because it created monopolies.
c. because european countries had colonies.
d. because america had once been a colony of great britain.

Because America had one been a Colony of Great Britain.
A hundred years later, The USA decided to take their own land in the same way the UK did, which was conquering it with their people, building colonies, and taxing the hell out of them.
Hope this Helps :)

An example of a political opponent would be albert einstein hitler hated him because he was jewish a pacifist