As for the US, its imperial foray lasted barely more than a decade.
Obama may not be an imperialist, but he has fortified the imperial presidency as George W. Bush created it.
Did a group of righteous warriors throw off the yoke of imperial oppression?
late 14c., "having a commanding quality," from Old French imperial (12c.), from Latin imperialis "of the empire or emperor," from imperium (see empire). Meaning "pertaining to an empire" (especially the Roman) is from late 14c. Imperial presidency in a U.S. context traces to Arthur Schlesinger Jr.'s book on the Nixon administration (1974). Related: Imperially.