World War I - Wikipedia, the free encyclopedia
1 Etymology 2 Background 2.1 Political and military alliances 2.2 Arms race 2.3 Conflicts in the Balkans 3 Prelude 3.1 Sarajevo assassination 3.2 Escalation of violence in Bosnia and Herzegovina 3.3 July Crisis 4 Progress of the war 4.1 Opening hostilitie...