The document summarizes the key causes and events of World War 1:
Nationalism, imperialism, militarism, and the alliance system caused rising tensions in Europe. The assassination of Archduke Franz Ferdinand ignited war after Austria-Hungary declared war on Serbia and the alliances pulled other nations into conflict. Over 4 years of brutal trench warfare ensued with new weapons and massive casualties, until American entry into the war in 1917 tipped the balance, and Germany surrendered on November 11, 1918, ending World War 1.