Eventos
militarism was used to build strong militariesnationalism caused tensionFranz Ferdinand was assassinated
Austria-Hungary declares war on Serbia
Germany declares war on RussiaGermany threatens submarine warfare
German u-boats torpedoes the Lusitania
Serbia is invaded by Germany, Austria, and Bulgariatriple alliance is formedU.S. president Wilson is reelectedGermans resume unrestricted submarine warfare
United States is alerted about the Zimmerman Note
The United States declares war on GermanyTreaty of Brest-Litovsk is signed between Russia and GermanyGermany ratifies Treaty of Versailles
U.S. senate refuses to ratify the Treaty of Versallies
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