e of Belgium in case of a conflict in which Great Britain, France, and Germany were involved, to observe their guarantee. Great Britain, one of the witnesses, on August 4, sent an ultimatum to Germany demanding that Belgian justice be respected. When Germany refused, Britain declared war on it the same day. Italy remained uninvolved until May 23, 1915, when, to satisfy its claims against Austria, it broke with the Triple Alliance and declared war on Austria - Hungary. In September 1914, Allied unity was made stronger by the Pact of London, signed by France, Great Britain, and Russia. As the war progressed, other countries, including Turkey, Japan, the U.S., and other nations of the western hemisphere, were drawn into the conflict. Japan, which had made an alliance with the Great Britain in 1902, declared war on Germany on August 23, 1914. The United States declared war on Germany on April 6, 1917. ...
