Spider Martin's most well-known photograph, Two Minute Warning, shows marchers facing a line of state troopers in Selma moments before police beat the protestors on March 7, 1965. The day became known as Bloody Sunday.
Spider Martin/Courtesy Tracy Martin
In this Sunday, Jan. 18, 2015, photo, marchers hold up cellular phones to record the rapper Common and singer-songwriter John Legend performing at the foot of the Edmund Pettus Bridge.
David Oyelowo portrays Rev. Martin Luther King Jr. in Selma. He says his experience growing up in Nigeria, without experiencing being a minority, helped him approach the job of playing such an iconic figure with less baggage than an American actor might.
Atsushi Nishijima/Paramount Pictures/AP
Historian Peniel Joseph says criticism of the film Selma as historically inaccurate is misguided, and that the movie correctly portrays African-Americans as the drivers of the civil rights movement.
Kelvin Ma/Peniel Joseph