What caused a revival of conservatism after world war ii?

A revival of conservatism was done to by President Truman in effect of the results that war had left to the people. Conservatism was not a sign of defeat that time but a time to listen and analyze the events that have transpired. It led President Truman to think of ways to prevent war from happening again, not only to protect the people of America but also of the world.

If your answers look like this a) expansion through conquestb) development of a calendar c) development of a written language d) creation of a large road workthen the answer is dhope it

Interpreting the results of his experiment : )