World War I was caused by militarism, alliances, imperialism, and nationalism in Europe. Militarism led to an arms race between countries as they built up their militaries. Alliances pulled many countries into the war once it began as countries were bound by treaties to support their allies. Imperialism and competition for colonies intensified rivalries. Nationalism heightened tensions as countries sought to create or break from empires and ethnic differences grew between nations. The assassination of Archduke Franz Ferdinand by a Serbian terrorist led Austria-Hungary to declare war on Serbia, pulling the rest of Europe into the war through their alliances.
3. MilitarismMilitarism: fascination with military power and the glory of warLed to Arms Race When a nation built up its military, its enemies saw it as a move toward warEx. Germany built up its navy to compete with Great Britain’s navy, causing tension between the two countries
5. :World War I Alliances:The Allied Powers (The Allies)Great BritainFranceRussia (until 1917)Italy (after 1915)The United States (after 1917)The Central PowersGermanyAustria-HungaryBulgariaThe Ottoman Empire
6. ImperialismImperialism: building empires by expanding territory and gaining coloniesCompetition for colonies led to intense rivalries among the European powersEx. Germany and Italy wanted to create empires that would compete with those of Great Britain and France
7. NationalismNationalism: strong feelings of pride and unity among a particular group of peopleWorsened rivalries between European powersLed nations to seek to create empires or break away from them
8. Led to ethnic and ideological differences between nationsTrouble in the Balkans (multi-ethnic region of Southeastern Europe)Serbia wanted to take control of BosniaAustria-Hungary took over BosniaArchduke Franz Ferdinand (the heir to the throne of Austria-Hungary) was assassinated by a Serbian terroristAustria-Hungary declared war on Serbia