March 31, 2002 All Roads Lead to D.C. By EMILY EAKIN The Associated Press Emperor Commodus receiving homage in ancient Rome, as imagined in a scene from the movie "Gladiator." STRUGGLING to get a handle on American foreign policy? For starters, try dusting off your Livy and boning up on the Second Punic War. Or dip into a good history of 19th-century Britain, paying close attention to those dazzling military campaigns in the Middle East — the Battle of Omdurman, say, or the Second Afghan War. Today, America is no mere superpower or hegemon but a full-blown empire in the...