Spike Lee directed, wrote and starred in "Do the Right Thing." The landmark film prompted a national conversation about racial tension. Universal/The Kobal Collection hide caption

itoggle caption Universal/The Kobal Collection

Signs marking the entrance to the Pine Ridge Indian Reservation in South Dakota make it clear when you're literally "off the reservation," but the figurative meaning of the phrase has shifted over time. Kristi Eaton/AP hide caption

itoggle caption Kristi Eaton/AP

Two young girls watch a World Cup soccer match on a television at the U.S. Customs and Border Protection Nogales Placement Center in Nogales, Ariz. Ross D. Franklin/AP hide caption

itoggle caption Ross D. Franklin/AP

Marion Cotillard stars in The Immigrant, director James Gray's film about a Polish woman's experience after she disembarks at Ellis Island. Anne Joyce/Courtesy of the Weinstein Company hide caption

itoggle caption Anne Joyce/Courtesy of the Weinstein Company

Mississippi Freedom Democratic Party delegates and supporters stage a demonstration on the boardwalk in front of the Atlantic City Convention Center in 1964. Courtesy of George Ballis/Take Stock hide caption

itoggle caption Courtesy of George Ballis/Take Stock

Aaron Carapella, a self-taught mapmaker in Warner, Okla., has designed a map of Native American tribes showing their locations before first contact with Europeans. Hansi Lo Wang/NPR hide caption

itoggle caption Hansi Lo Wang/NPR