What stated that the U.S. would provide finances to anyone who fought against Communism?

The Truman Doctrine established in March 12, 1947 by President Harry S. Truman and later updated in July 12, 1948 was an American policy that stated purpose to counter Soviet geopolitical expansion during the Cold War by providing political, military and economic assistance to all democratic nations under threat from internal and external authoritarian forces.

It implies American support for nations allegedly threatened by Soviet communism. The Truman Doctrine became the foundation of American foreign policy which led to the formation of NATO in 1949, which is a military alliance that is still in effect.