A Canadian soldier at the studio of Jos. Grenier of Montreal. Some of the flags in this group date this photo after October 1917. The United States entering the war on April 6, 1917. Cuba declared war the next day and Guatemala about two weeks later. Brazil, whose flag is barely visible in the upper left corner, declared war on Germany on October 26, 1917. The latest of all the countries represented here to join the Allies.