The Bosnian War from 1992-1995 was caused by deep-seated ethnic tensions and nationalism that increased over centuries as the populations of Bosnia and Herzegovina identified themselves more strongly as Bosniaks, Serbs, or Croats. Centuries of resistance to foreign rule and the oppression of some groups by others led to mistrust between ethnicities. The end of communism in Yugoslavia allowed these ethnic identities to flourish, but also unleashed ethnic hatred. Fighting broke out over territorial disputes, and accusations of ethnic cleansing and genocide occurred before NATO intervened and a peace agreement was signed. Over 100,000 people were killed in the war and 1.8 million displaced.