A Birmingham, Ala., police officer provides security as thousands of young students prepare to march through downtown Birmingham, Ala., Thursday, May 2, 2013. Students from a dozen high

 

              A Birmingham, Ala., police officer provides security as thousands of young students prepare to march through downtown Birmingham, Ala., Thursday, May 2, 2013. Students from a dozen high
A Birmingham, Ala., police officer provides security as thousands of young students prepare to march through downtown Birmingham, Ala., Thursday, May 2, 2013. Students from a dozen high schools and colleges marched from the city's 16th Street Baptist Church to mark the 50th anniversary of the Children's Crusade against racial segregation in 1963. The march 50 years ago was led by the Rev. Martin Luther King Jr. and ended with city leaders unleashing fire hoses and police dogs on demonstrators. Public outcry helped spur passage of the Civil Rights Act of 1964. (AP Photo/Dave Martin)