Answer:
Most of the countries that received aid through programs such as the Marshall Plan after World War II joined the North Atlantic Treaty Organization (NATO). NATO is a military alliance formed in 1949 by several Western European and North American countries, including the United States. Its primary objective was to provide collective defense and security against the threat of the Soviet Union and its allies during the Cold War. The countries that received aid through the Marshall Plan, such as West Germany, France, Italy, and others, often became members of NATO as part of their broader alignment with Western democratic nations.