A group of visitors to Central High School, in Little Rock, Ark., listen as Interpretive Park Ranger Jodi Morris, speaks about the “Little Rock Nine,” Feb. 28, 2018. President Dwight D. Eisenhower had to intervene when the group of nine African American students were prevented from entering the school in 1957. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)