What is the Truman Doctrine us strategy?

The Truman Doctrine, announced in 1947 by President Harry Truman, was a U.S. foreign policy strategy aimed at containing the spread of communism during the Cold War. It asserted that the U.S. would support countries resisting communist influence, particularly in Europe and the Middle East, through political, military, and economic assistance. This doctrine marked a significant shift in American foreign policy from isolationism to active engagement in global conflicts to curb Soviet expansion.