When Harry S. Truman assumed the Oval Office he became the one in charge of U.S. role in post-war international relations.
Domestic policies reffer to the administrative decisions directly related to the activity (including issues) at the nation's borders. It is different from foreign policy, as that one takes care of the ways a government make advances in world politics based on its interests.
In my opinion it is very important to create new laws, and plans of actions during or post war era. In September 1945, Truman presented to Congress a message that to set the post-war economic and political issues. Truman requested public works programs (full employment with higher minimum wage) a war-time agency monitoring discrimination against African Americans and a larger Social Security System, and a national health insurance system.
Truman created the National Security Act in 1947 which combined the War Department and the Department of the Navy led by the Secretary of Defense. He was also responsible for the creation of an Air Force Department separate from the existing "United States Army Air Forces". In addition to the military reorganization, the National Security Act established the National Security Council, a coordination center for national security policy in the executive branch, and the Central Intelligence Agency (CIA); the first American intelligence agency established in times of peace therefor I believe Truman had good leadership and set the foundations dor US security and way of living.
