Answer:
In 1963 about 250,000 Americans of all races joined together in Washington D.C., to stand firm against racial injustice and to demand the passage of national civil rights legislation. At the March on Washington, Martin Luther King proclaimed, “I have a dream,” invoking the hopes of all Americans seeking racial harmony. The official poster, platform pass, and handbill are from the march.
March on Washington
March on Washington
Organizers of the March on Washington lead demonstrators to the Lincoln Memorial, 1963
(Courtesy of National Archives, Washington, D.C.)
Hope it helps