Modern political science rejects, correctly, the notion that one man c
an make his country's foreign policy just as he pleases. Modern politi
cal science asserts, correctly, that behind every 'output,' or policy
decision, there lurk a dozen 'inputs'-the economy, opinion, military m
ight and morale, political structure, political culture, competing eli
tes, and all the others - that constrain the would-be foreign policyma
ker on horseback.