The most significant social legislation passed by any Congress in the history of the United States was the: A. Health Maintenance Organization Act of 1973. B. Hill-Burton Act of 1946. C. Social Security Act amendments creating Medicaid and Medicare. D. Social Security Act of 1935.

D. Social Security Act of 1935.

Explanation:

The Social Security Act, signed into law by President Roosevelt in 1935 is the most significant social legislation passed by any U.S. Congress for the simple reason that before it, the United States was the only advanced nation that lacked any form of social security law whatsoever.

This act, signed amidst the great depression, inaugurated two fundamental programs in the United States: Social Security, which is funded by payroll taxes and benefits the elderly, and Unemployment Benefits, which are administered by the states with funding help from the Federal Government.

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