Final answer:
Truman's Fair Deal built upon the New Deal set of policies introduced by Franklin D. Roosevelt, aiming to expand on these social and economic reforms. However, many aspects of the Fair Deal were rejected by a more conservative Congress, including the proposal for national healthcare.
Step-by-step explanation:
Truman's presidential policies, known as the Fair Deal, built upon the New Deal put into place by his predecessor, Franklin D. Roosevelt (FDR). The Fair Deal aimed to expand on the social and economic reforms of the New Deal, which included a wide range of welfare and relief programs designed to combat the effects of the Great Depression. While Truman aspired to extend and enlarge these programs to include health insurance, a higher minimum wage, and several other social reforms, he encountered significant opposition from a more conservative Congress which had gained power following the 1946 elections. As a result, although some elements of the Fair Deal were successful, such as public housing and Social Security expansion, many, including Truman's proposal for national healthcare, were rejected by Congress.