To continue the thread that has been posted that almost every part of the globe has seen conflict, I thought it might be interesting to discuss which region has seen either
A. the most wars
B. the most brutal/bloody conflicts
For example, you can argue North America has seen the most brutal wars - from the bloodletting of the Civil War to the genocide of the Indian wars to the violent Mexican and Latin American revolutions- even if the continent hasn't obviously experienced the sheer number of conflicts as, say, Europe. Of course, you can say Europe simply for the sheer number of wars dating back to the earliest Greek states.
A few ground rules:
1. No race baiting here. Feel free to talk about white colonialism for example, but don't say whites are the most vicious people who have ever lived and have created most of the conflict around the world. Same goes for making Africans out to be psychotic machete wielding rebels, all Hispanics out to be narco-terrorists, etc. It is allright to discuss how one culture from one continent caused widespread destruction to another - mongols in Europe, Europeans in Africa and the Americas, African Carthiginians in Italy, etc.
2. Just to make things interesting, I'm going to say the Middle East, with the exception of Turkey, is considered part of Asia. Most of Russia should be considered part of Europe, unless you're talking about the far eastern part of the old empire or Soviet state, ie the Russo-Japanese war. Latin America will count as South America.
I also want to keep posts to recognizable conflicts that we have some historical/archaeological evidence for. No discussions about Atlantis or the great war between Roman legions and the American Navajo (some people believe in this by the way).