U.S. president Lyndon B. Johnson signs the Social Security Act of 1965 into law, establishing Medicare and Medicaid.

Lyndon Baines Johnson, also known as LBJ, was the 36th president of the United States from 1963 to 1969. Johnson was vice president under John F. Kennedy from 1961 until Kennedy's assassination in 1963, when he assumed the presidency. Before becoming vice president, he served in both houses of the…