On March 21, 1965, civil rights demonstrators led by the Rev. Martin Luther King Jr. began their third attempt to march from Selma to Montgomery, Alabama — this time under the escort of U.S. Army and National Guard troops assigned by President Lyndon B. Johnson.

On March 21, 1965, civil rights demonstrators led by the Rev. Martin Luther King Jr. began their third attempt to march from Selma to Montgomery, Alabama — this time under the escort of U.S. Army and National Guard troops assigned by President Lyndon B. Johnson.