Final answer:
President Truman used the Truman Doctrine to provide military and economic aid in order to limit the spread of communism in East Asia.
Step-by-step explanation:
President Truman used the power of the presidency to limit the spread of communism in East Asia through the employment of the Truman Doctrine. The Truman Doctrine allowed the United States to provide military and economic aid to countries threatened by communism. This aid helped strengthen these countries' ability to resist communism and served as a means of containment. For example, Truman provided military aid to Greece and Turkey to assist them in their civil wars against communist forces.