The most valid generalization that applies to the making of foreign policy in most nations is that O The formation of foreign policy always depends ultimately on the approval of the voters
O Economic considerations rarely influence relations with other nations
O National self-interest determines international actions
O Military and economic alliances are unreliable means of ensuring national security

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: