Medicare and Medicaid were part of what system developed during the New Deal.

Medicare and Medicaid were part of the Social Security system developed during the New Deal under President Franklin Roosevelt.

The Social Security Act of 1935 created the Social Security Board to oversee the new programs of social insurance to care for workers in their old age, as well as providing unemployment insurance, aid to mothers of dependent children and blind and physically disabled persons.

The Social Security Board was renamed the Social Security Administration in 1946. In 1965, under the Lyndon Johnson administration, the Social Security Act Amendments were passed and signed into law, creating the health benefits programs known as Medicare and Medicaid.