In 1903, W.E.B. Du Bois, the eminent American sociologist, scholar, and leader, wrote that “the problem of the twentieth century is the problem of the color-line.” Recent events in Ferguson, Missouri; Staten Island, New York; Cleveland, Ohio; and North Charleston, South Carolina should make us realize that, despite America’s recent racial progress, the problem of the 21st century is still the color-line. Harlem’s Rattlers lays bare the bigotry that African-American citizens faced in the early 20th century and, more importantly, details the innumerable accomplishments by black American soldiers despite the racism propagated by the President of the United States, U.S. military, and bigoted American civilians.