Question

In recent decades American political thinking has become more ???

Answer 1

In recent decades american political thinking has become more CONSERVATIVE

Answer 2

In recent decades American political thinking has become more conservative.

Conservatism is a political and social philosophy which fosters traditional social institutions in the context of culture and civilization. The main principles of conservatism are tradition, human imperfection, organic society, hierarchy, authority, and property rights.

American conservatism refers to a system of political beliefs consisting on  respect for American traditions, republicanism, support for Judeo-Christian values, moral universalism, business, anti-communism, individualism, advocacy of American exceptionalism.