TIME LINE PHOTOS 1526-1865: PHOTOGRAPHS AND PRINTS DIVISION, SCHOMBURG CENTER FOR RESEARCH IN BLACK CULTURE, NEW YORK PUBLIC LIBRARY, ASTOR, LENOX AND TILDEN FOUNDATIONS (ADVERTISEMENT); BETTMANN/CORBIS. 1866-1909: LIBRARY OF CONGRESS (JIM CROW); LIGHTFOOT/GETTY IMAGES (SHARECROPPERS); BETTMANN/CORBIS. 1910-1949: BALTIMORE AFRO-AMERICAN, AFRO-AMERICAN NEWSPAPERS ARCHIVES AND RESEARCH CENTER (NEWSPAPER); HULTON ARCHIVE/GETTY IMAGES (LYNCHING); SCHOMBURG, NYPL (SOLDIERS); BETTMANN/CORBIS. 1950-1969: AFP/GETTY IMAGES (MARTIN LUTHER KING, JR.); BILL HUDSON, AP IMAGES (DOG ATTACK); DIVISION OF POLITICAL HISTORY, NATIONAL MUSEUM OF AMERICAN HISTORY, SMITHSONIAN INSTITUTION (BLACK IS BEAUTIFUL); BETTMANN/CORBIS. 1970-2000S: TIMOTHY FADEK, CORBIS (TONI MORRISON); PICTORIAL PARADE/GETTY IMAGES (SHIRLEY CHISHOLM); M. SPENCER GREEN, AP IMAGES (BARACK OBAMA)