How do Americans decide whether their country should use military force abr
oad? We argue they combine dispositional preferences and ideas about the ge
opolitical situation. This article reports the results of a representative
national survey that incorporated Jive experiments. Findings include the fo
llowing: (I) Respondent dispositions, especially isolationism versus intern
ationalism and assertiveness versus accommodativeness, consistently constra
ined policy preferences, whereas liberalism-conservatism did net; (2) featu
res of the geopolitical context-the presence of U.S. interests, relative po
wer the images of the adversary's motivations and judgments about cultural
status-also influenced support for military intervention; and (3) systemati
c interactions emerged between dispositions and geopolitical context that s
hed light on when and why ideological disagreements about the use of force
are likely to be amplified and attenuated by situational factors. Our resul
ts are consistent with a cognitive-interactionist perspective, in which peo
ple adapt broad predispositions in relatively thoughtful ways to specific f
oreign policy problems.