The March on Washington for Jobs and Freedom was one of the call be a number of civil rights and religious organizations to demonstrate for civil and economic rights for all Americans, particularly blacks. On this occasion, on Wednesday, August 28, 1963, Martin Luther King, Jr., standing in front of the Lincoln Memorial, delivered his historic "I Have a Dream" speech. Estimates of the numbers of participants, most of whom were black, range from 200,000 to 300,000.