History of the provisions of the old-age, survivors, disability, and health insurance program.
D000368:Aged; D004608:Eligibility Determination / Q000331:legislation & jurisprudence; D049673:History, 20th Century; D006801:Humans; D007342:Insurance Benefits; D008484:Medicaid / Q000266:history*; D006278:Medicare / Q000266:history*; D012943:Social Security / Q000266:history*; D014481:United States