There is no reason for imperialism other than greed and fear. Since the US never really had to fear any country after the War of 1812 I would have to say fear was not a reason for imperialism!
i dont have a answer :(
butt
Money and Power
The lack of atmosphere on the moon
"Humanitarian intervention" - same as always.
Same reason Great Britain attacked whomever....Imperialism.
to increase the population of a country.
Imperialism can cause things like war and make other countries hate you and see you as a bully.
interest in controlling foreign oil supplies(:
the reason is because of what it was like there
Principally the continent of Europe and Northern Asia (Russia, etc.), China and some other Far Eastern countries.