I think it is on account of there is bigotry toward differences and on the grounds that there is dependably an area of the group that longings control and in light of the fact that there aren't sufficient assets to agreeably meet the essential needs of humankind, not to mention the needs. The variable likewise incorporates avarice. Not really cash but rather likewise the quest for region, assets, power and strength have and will keep on driving individuals to war.
Research suggests that negotiators may naturally negotiate differently when they are with people from their own culture than when they are with people from other cultures is true. Hope this helped! :)
The last one i hope this helps