In case you don't know the history, here is what Wikipedia has to say:
The Little Rock Nine were a group of nine African American students enrolled in Little Rock Central High School in 1957. Their enrollment was followed by the Little Rock Crisis, in which the students were initially prevented from entering the racially segregated school by Orval Faubus, the Governor of Arkansas. They then attended after the intervention of President Dwight D. Eisenhower.
The U.S. Supreme Court issued its historic Brown v. Board of Education of Topeka, Kansas, 347 U.S. 483, on May 17, 1954. Tied to the 14th Amendment, the decision declared all laws establishing segregated schools to be unconstitutional, and it called for the desegregation of all schools throughout the nation. After the decision, the National Association for the Advancement of Colored People (NAACP) attempted to register black students in previously all-white schools in cities throughout the South. In Little Rock, the capital city of Arkansas, the Little Rock School Board agreed to comply with the high court's ruling. Virgil Blossom, the Superintendent of Schools, submitted a plan of gradual integration to the school board on May 24, 1955, which the board unanimously approved. The plan would be implemented during the fall of the 1957 school year, which would begin in September 1957.
By 1957, the NAACP had registered nine black students to attend the previously all-white Little Rock Central High, selected on the criteria of excellent grades and attendance. The nicknamed "Little Rock Nine" consisted of Ernest Green (b. 1941), Elizabeth Eckford (b. 1941), Jefferson Thomas (1942–2010), Terrence Roberts (b. 1941), Carlotta Walls LaNier (b. 1942), Minnijean Brown (b. 1941), Gloria Ray Karlmark (b. 1942), Thelma Mothershed (b. 1940), and Melba Pattillo Beals (b. 1941). Ernest Green was the first African American to graduate from Central High School.