Americans are remembering "Bloody Sunday".
Vice President Joe Biden traveled to Selma, Alabama today Sunday to help mark the anniversary of the historic 1965 civil rights march.
Peaceful protesters, asking for the right to vote, were beat by police and attacked by dogs as they tried to cross a bridge.
Biden delivered the keynote address at the Martin and Coretta King Unity Brunch.
He says the march and events surrounding it were an awakening for him and other Americans, too.
"Nothing shaped my consciousness or the conscious of an awful lot of other white men and women and white boys all over the country than what happened here in Selma. Nothing. Some of you are right here in this room, to this day. What happened 48 years ago on March the 7th at the Edmund Pettus Bridge forced America, it forced America to confront the fact that massive injustice still prevailed," said Biden.
This year's commemoration comes just a few days after the US Supreme Court heard oral arguments on a crucial part of the Voting Rights Act of 1965.