It won't let me add a comment for my pick. So here it is... "The more homogenous a region is, the less conflict it seems to have. The vast majority of Europe is Christian, so having a western European nation be ruled by Muslims will only increase the likelihood of conflict in the region. Plus the Moors weren't exactly the perfect people either. They conquered the region from the Visigoth Christians and even tried to defeat the Franks. They were foreign conquerers, nothing more."