How did Truman's confrontation with Stalin at Potsdam affect the relationship between the United States and its allies?

The 20th amendment, also called the lame duck amendment, decreased the amount of time between the presidential election and the inaugration of the new president. what are the advancements that allowed for this amendment?

Someone who accepted the beliefs of social darwinism would have also agreed with which of these statements?

What is the definition of federalism