MLK: Taron Shekaru 50 na Tunawa da Gangamin Washington

U.S. President Barack Obama speaks during a ceremony marking the 50th anniversary of Martin Luther King Jr.'s "I have a dream" speech on the steps of the Lincoln Memorial in Washington, Aug. 28, 2013.

Filipe Nyusi no Chimoio, província de Manica

Three women who attended marches in the past, from left, Armanda Hawkins of Memphis, Vera Moore of Washington, and Betty Waller Gray of Richmond, Va., (holding sign) listen to the speakers during the March on Washington, Aug. 28, 2013, at the Lincoln Memorial.

The group Junkaroo performs at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom.

Crowds gather on the National Mall to commemorate the 50th Anniversary of the March on Washington, August 28, 2013.

Martin Luther King III speaks during a ceremony marking the 50th anniversary of his father Martin Luther King, Jr.'s "I Have a Dream" speech on the steps of the Lincoln Memorial in Washington, August 28, 2013. 

Filipe Nyusi no Gurué, província da Zambézia

Former presidents Jimmy Carter and Bill Clinton arrive at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Aug. 28, 2013.

Actor Jamie Foxx speaks during a ceremony marking the 50th anniversary of Martin Luther King, Jr.'s "I Have a Dream" speech on the steps of the Lincoln Memorial in Washington, August 28, 2013. 

A woman stands in the crowd taking part in the anniversary of the March on Washington, August 28, 2013. (R. Green/VOA)