ABSTRACT
IN TH E NINETEENT H CENTURY , whe n U.S . foreign in -terests wer e limite d primaril y t o trad e an d wester n ex -pansion, presidents often coul d concentrate on domestic policy. Today th e wid e arra y o f U.S . economic, political , an d military commitment s virtuall y ensure s tha t president s wil l spend at least half of their time on foreign affairs .
