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Fifty-one years ago, voting rights marchers were met with police violence while trying to cross the Edmund Pettus Bridge in Selma, Alabama. Last year the nation marked the 50th anniversary of Bloody Sunday with a march led by the first African-American president. The U.S. has come a long way, but with voting rights still being contested in Alabama, North Carolina and other states, it's clear the movement's history is still being written. (At top, National Archives photo by Spider Martin via the IIIP Photo Archives Flickr account; below, official White House photo by Lawrence Jackson.)