There isn&#x27;t a single one in the history of the world that lasted for long time.<p>There&#x27;s so much research out there that shows that multiculturalism is the root of conflicts. For example [0] and see references too.<p>Just look at the current French republic and how that worked out for them. [1]<p>[0] <a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1110.1409" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1110.1409</a><p>[1] <a href="http:&#x2F;&#x2F;www.telegraph.co.uk&#x2F;news&#x2F;worldnews&#x2F;europe&#x2F;france&#x2F;11995821&#x2F;Paris-attacks-have-put-a-dagger-through-the-heart-of-liberal-Europe.html" rel="nofollow">http:&#x2F;&#x2F;www.telegraph.co.uk&#x2F;news&#x2F;worldnews&#x2F;europe&#x2F;france&#x2F;1199...</a>