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Narrated / Close-up of a cross and hundreds of grave markers at military cemetery / Thousands of military grave markers / A book cover with the title History Of The United States / Title page of book The History Of The United States from The Earliest Period To The Administration Of James Buchanan / Soldiers on horseback riding across field / Page from book with chapter title The Spanish American War and The Panama Canal / American soldiers fighting battle in the Spanish American War / Page from book with chapter title World War One 1914 to 1918 / American soldiers in battle during World War I / Injured horse falling into trench during battle of World War I / Page from book with chapter title World War II 1939-1945 / American soldiers marching in formation / American soldiers fire guns and artillery