Was the US an european colony? With people speaking French, English, Spanish and Portuguese? I guess it was a mix and match of many human being that decided to be free : no more, no less. Freedom was the driver, not the enemy.

Also maybe you should consider the actual state of US : What's the percentage of english/spanish people speaking? What about Catholics/Jews/Muslim? Should we expect an USbreak ?

Saying that, I do not believe that we need a common enemy to be united. There is better values and challenges for all of us : environment, peace, love. Europe will stand strong, refine its vision to the current context. After a few years, UK we be back and we will all make love peacefully in a better environment.

Long live to Europe.