EVB2929543: Portrait of a policeman, original title: 'Town policeman, Litchfield, Minnesota', photograph by John Vachon, September, 1939, Vachon, John (1914-75) / Bridgeman Images

EVB2929267: World War II, U.S. soldier sighting the enemy, c.1940-1946 / Bridgeman Images

EVB2929553: Child labor, scene in a canning factory, from original caption: 'showing a 7-year old girl who shucks 3 pots of oysters a day, and works regularly, and her 6-year old brother who helps, an 11-year old boy who does six pots a day', Lowdon Canning Co. Blufton, South Carolina, February, photograph by Lewis Wickes Hine, 1913, Hine, Lewis Wickes (1874-1940) / Bridgeman Images

EVB2929288: World War II, original caption: 'The deadly marksmanship of the United States Army Air Force bombers is graphically illustrated in this picture just received from North Afric. It shows direct hits on harbor warehouses and terminals and a pierhead at Sousse, the important Axis-held Mediterranean seaport in Tunisia', c.1943 / Bridgeman Images

EVB2929291: World War II, United States planes in echelon formation, from the top: Boeing Flying Fortress B17, Douglas Transport, Consolidated Liberator B-24, c.1942 / Bridgeman Images

EVB2927201: John F. Kennedy and Richard Nixon after the Kennedy-Nixon debates, Sept.-Oct. 1960 / Bridgeman Images

EVB2926942: George Gordon Byron (Lord Byron) / Bridgeman Images

EVB2927283: Lindy Boggs after voting in the special election in which she hopes to fill her late husband, Hale Boggs', seat in the House of Representatives, New Orleans, 1973 / Bridgeman Images

EVB2927018: Dr. Harold Edgarton, of M.I.T., stands behind his camera that boasts ultra-speed photography, with pictures being taken at 1/100,000th of a second. 12/7/38. / Bridgeman Images

EVB2927314: British Royalty. Westminster Abbey, London, England, c.1930s / Bridgeman Images

EVB2927329: Marian Anderson, contralto, singing on The Telephone Hour, an NBC radio program in 1943. / Bridgeman Images

EVB2927094: James Beard, 1963 / Bridgeman Images

EVB2927163: John Jacob Astor VI and wife Ellen Tuck French aboard the SS Normandie, 1937 / Bridgeman Images

EVB2927243: Korean War: Civilians loading a cart with their belongings before fleeing Seoul, Korea, 1950., Unknown photographer, (20th century) / Bridgeman Images

EVB2927442: GANDHI STARTS HIS CAMPAIGN AGAINST ENGLAND / Bridgeman Images

EVB2927323: The RMS Lusitania, 1900's. / Bridgeman Images

EVB2927343: PRESIDENT MARSHAL TITO of Yugoslavia preparing to celebrate his 70th birthday on May 25. 5/23/62 / Bridgeman Images

EVB2927493: Acrid fumes from a tear-gas bomb spread through the N.Y. Stock Exchange; photo shows emergency wagons outside the exchange. N.Y.C. August 4, 1933. / Bridgeman Images

EVB2927497: NEW YORK CITY, R.H. Macy's the first store in New York City, 1869. / Bridgeman Images

EVB2927935: Sorting the mail in a railway post office on a mail train, 1930s. / Bridgeman Images

EVB2927942: A typewriter designed to conserve the metal needed for the war effort during World War II, c. 1940s. / Bridgeman Images

EVB2927517: Over 6,000 people marching down Fifth Avenue in the annual parade to honor New York Police Officers, May 20, 1912. / Bridgeman Images

EVB2927967: Vietnam War, B-52 Stratofortress (from the Third Air Division's 4133rd Bombardment Wing) releasing a 'bomb train' over targets in Vietnam, 03/31/67 / Bridgeman Images

EVB2927527: Columbus Circle: The Macy's Thanksgiving Day Parade, New York, November 21, 1941. / Bridgeman Images

EVB2927979: U.S. Tanks behind a South Vietnamese ox cart, Trung Lap, South Vietnam, January 17, 1966 / Bridgeman Images

EVB2928000: Wanda Landowska, harpsichordist, as she appeared in Warsaw for her first recital at the age of four. The program consisted of Mozart sonatas. / Bridgeman Images

EVB2928013: The Senate Watergate Committee. Foreground from left: Senator Lowell Weicker, Senator Edward Gurney, deputy counsel Rufus Edmisten, Senator Howard Baker, Senator Sam Ervin, assistant chief counsel David Dorsen, Senator Herman Talmadge, Senator Daniel Inouye, Senator Joseph Montoya, Washington DC, August 7, 1973 / Bridgeman Images

EVB2927566: Crowds in Times Square await the results of the Presidential election. The New York Times Building announces an early lead for Dwight Eisenhower. New York City, November 4, 1952 / Bridgeman Images

EVB2928055: Crowds at the World's Fair, Chicago, Illinois, 1934. / Bridgeman Images

EVB2927581: Captain Frank Hawks' new Speed Plane flying over Manhattan's financial district and Battery Park, New York City, April 3, 1937 / Bridgeman Images

EVB2928077: Don't be a dope and spread inside dope. Loose talk can cost lives, 1942 (poster), Beall, Cecil Calvert (1892-1967) / Bridgeman Images

EVB2927618: American Willie Davenport wins the gold medal for the 110-meter hurdles in Mexico City. American Ervin Hall won the silver medal and Italian Eddy Ottoz won the bronze, 1968 / Bridgeman Images

EVB2928087: Crowds in Times Square, New York celebrating the end of World War II, 1945. / Bridgeman Images

EVB2927630: The Panama Canal, c.1930s / Bridgeman Images

EVB2927685: A young Buddhist monk burned himself to death in Saigon's Market Square, to protest the government's religious policies. 1963 / Bridgeman Images

EVB2927703: The America First Committee, protesting the United States entry into World War II, New York, November, 4, 1941 / Bridgeman Images