1963    In Dallas, Texas, US President John F. Kennedy is killed and Texas Governor John B. Connally is seriously wounded by Lee Harvey Oswald, who is later captured and charged with the murder of police officer J. D. Tippit. That same day, US Vice-President Lyndon B. Johnson is sworn in as the 36th President of the United States.

1963    Vietnam War: Newly sworn-in US President Lyndon B. Johnson confirms that the United States intends to continue supporting South Vietnam both militarily and economically.

1963    U.S. President Lyndon B. Johnson establishes the Warren Commission to investigate the assassination of President John F. Kennedy.

1964    President Lyndon B. Johnson declares a "War on Poverty" in the United States.

1964    U.S. President Lyndon B. Johnson announces the goals of his Great Society social reforms to bring an "end to poverty and racial injustice" in America.

1964    U.S. President Lyndon B. Johnson signs the Civil Rights Act of 1964 meant to prohibit segregation in public places.

1964    Vietnam War: the U.S. Congress passes the Gulf of Tonkin Resolution giving US President Lyndon B. Johnson broad war powers to deal with North Vietnamese attacks on American forces.

1964    Vietnam War: National Security Council members agree to recommend that U.S. President Lyndon B. Johnson adopt a plan for a two-stage escalation of bombing in North Vietnam.

1964    Vietnam War: U.S. President Lyndon B. Johnson and his top-ranking advisers meet to discuss plans to bomb North Vietnam.

1965    United States President Lyndon B. Johnson proclaims his "Great Society" during his State of the Union address.

1965    President Lyndon B. Johnson, responding to the Selma crisis, tells U.S. Congress "We shall overcome" while advocating the Voting Rights Act.

1965    Vietnam War: U.S. President Lyndon B. Johnson announces his order to increase the number of United States troops in South Vietnam from 75,000 to 125,000.

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

1965    US President Lyndon B. Johnson signs the Voting Rights Act of 1965 into law.

1965    Vietnam War: The Pentagon tells U.S. President Lyndon B. Johnson that if planned operations are to succeed, the number of American troops in Vietnam has to be increased from 120,000 to 400,000.

1966    Lyndon B. Johnson states that the United States should stay in South Vietnam until Communist aggression there is ended.

1966    President Lyndon B. Johnson signs the Freedom of Information Act into United States law. The act goes into effect the next year.

1966    The National Traffic and Motor Vehicle Safety Act is signed into law by U.S. President Lyndon B. Johnson.

1966    U.S. President Lyndon B. Johnson, responding to a sniper attack at the University of Texas at Austin, writes a letter to Congress urging the enactment of gun control legislation.

1966    U.S. President Lyndon B. Johnson signs into law an antitrust exemption allowing the National Football League to merge with the upstart American Football League.

1967    U.S. President Lyndon B. Johnson nominates Solicitor-General Thurgood Marshall to become the first black justice on the U.S. Supreme Court.

1967    Cold War: U.S. President Lyndon B. Johnson meets with Soviet Premier Alexei Kosygin in Glassboro, New Jersey for the three-day Glassboro Summit Conference.

1967    Vietnam War: US President Lyndon B. Johnson and "The Wise Men" conclude that the American people should be given more optimistic reports on the progress of the war.

1967    US President Lyndon B. Johnson signs the Public Broadcasting Act of 1967, establishing the Corporation for Public Broadcasting.

1967    Vietnam War: Acting on optimistic reports that he had been given on November 13, US President Lyndon B. Johnson tells the nation that, while much remained to be done, "We are inflicting greater losses than we're taking...We are making progress."

1968    President Lyndon B. Johnson announces he will not run for re-election.

1968    President Lyndon B. Johnson signs the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing.

1968    U.S. President Lyndon B. Johnson declares a national day of mourning following the assassination of Senator Robert F. Kennedy.

1968    Vietnam War October surprise: Citing progress with the Paris peace talks, US President Lyndon B. Johnson announces to the nation that he has ordered a complete cessation of "all air, naval, and artillery bombardment of North Vietnam" effective November 1.