After World War I, Europeans divided Southwest Asia into several new nations. Why have these Southwest Asian nations experienced frequent conflict ever since? A European nations have constantly fought over the right to trade with them. B European efforts to isolate groups by religion have led to conflict over which groups should live where. C European colonists entering the new nations after World War I tried to force the native residents out of their homes. D European politicians did not consider the placement of religious and ethnic groups when dividing the former Ottoman Empire.