Yer fulla crap.. America has never been an Imperialist country.
We are the antithesis of the very idea
imperialism
Main Entry: im·pe·ri·al·ism Pronunciation: \im-ˈpir-ē-ə-ˌli-zəm\ Function: noun Date: 1826 1: imperial government, authority, or system 2: the policy, practice, or advocacy of extending the power and dominion of a nation especially by direct territorial acquisitions or by gaining indirect control over the political or economic life of other areas; broadly : the extension or imposition of power, authority, or influence
The USA's rule of ex-Spanish Imperial posessions won from the Spanish-American War pretty much qualified by the above defintion (umm, I presume Spain was an Imperial power when she owned these posessions, but when we beat Spain and took over the same posessions, we are .... what?)
What, pray tell, is YOUR definition of imperialism?