The sinking of the Lusitania was one of the events that brought the United States into World War I. The topics in this section cover some of the major concepts and events related to the start of the First World War.
Gallipoli Campaign, an Allied attempt in 1915, during World War I, to seize the Gallipoli Peninsula in Turkey and thus gain control of the Dardanelles strait, opening a supply route from the west to Russia through the Black Sea. See more »
London, Pact of, an agreement entered into on September 5, 1914, shortly after the outbreak of World War I.
See more »Scapa Flow, flω', a sheltered body of water in Scotland's Orkney Islands. This stretch of sea, about 15 miles (24 km) long and 8 miles (13 km) wide, was a major British naval base in World Wars I and II.
See more »Selective Service System , an independent agency of the United States government.
See more »Unknowns, Tomb of the, a national memorial to the unrecovered dead of the United States armed forces of World Wars I and II and the Korean War.
See more »Rapallo, Treaties of, international agreements signed at Rapallo, Italy, soon after World War I.
See more »Brest-Litovsk, Treaty of, in World War I, the peace treaty that Germany and its allies forced Russia to sign on March 3, 1918.
See more »Neuilly, Treaty of, November 27, 1919, the peace treaty signed by defeated Bulgaria and the World War I victors.
See more »Saint-Germain, Treaty of, the peace treaty between Austria and the Allied Powers at the end of World War I.
See more »Versailles, Treaty of, the peace treaty at the end of World War I, signed on June 28, 1919, by Germany and by the Allied and Associated Powers.
See more »Triple Alliance, a name given to several international agreements. The most important was a secret treaty that was signed by Germany, Austria-Hungary, and Italy in 1882 and remained in effect until 1915.
See more »Triple Entente, an informal alliance among Great Britain, France, and Russia in the period before World War I.
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