In order to formulate a comparative model of political cultures, a the
ory that integrates psychological, sociological and economic variables
is developed. Within societies dominant political cultural themes str
ess particular patterns of right and obligation. These patterns simult
aneously undergird social solidarity and justify an unequal distributi
on of rewards. Differences among political cultures exist vertically o
n an historical dimension of increasing moral comprehensiveness and ho
rizontally on a dimension of moral content. Internal tensions deriving
from technological development and from social discourse about the mo
ral adequacy of norms stimulate change. A case study of American polit
ical culture, with its contrasting emphases on egalitarianism and indi
vidualism, assesses the theoretical claims.