| Photos: Jewish women and children walk toward the gas
    chambers at Auschwitz-Birkenau, 1944. USHMM, courtesy of Yad Vashem;
    German troops parade through Warsaw, Poland, 1939. National
    Archives; German infantry during the invasion of the Soviet
    Union in 1941. USHMM, courtesy of Philipp Merillat;
    Adolf Hitler and Benito Mussolini in Munich, Germany, circa 1941. National
    Archives; Soldier of Company K, 110th Regiment Infantry,
    receives first aid in France, 1918. National Archives; Polish
    civilians clear the rubble of a bombed out building in Warsaw, Poland,
    1939. USHMM, Julien Bryan Archive  |