1. How did the Truman Doctrine change US foreign policy?

Explanation:

After WWII, it appeared as though the US and the Soviet Union were on a collision course. The Soviet Union showed no intention of ever leaving Eastern Europe, and its occupation of East Germany placed the Western sector of Berlin in jeopardy. The United States had already alienated the Soviet Union by creating the Marshall Plan for Western Europe in order to rebuild the region's infrastructure and economy. This money was offered to the Soviet Union as well, but Stalin did not want to join the IMF and World Bank so his bloc was left out. Churchill gave his "Iron Curtain" speech in Independence, Missouri, to wide acclaim.

the congress realized that action had to be.