We need to understand Euroep was a continent of constant wars for 1000 years. Most countries was constantly in war. When they end one they started new. Only in last century after EU was formed that changed. We need patience and Europe will achieve great things.
What if Europe was at war all the time because we just don't like each other and countries want more power? We still don't like each other but now countries fight about money and it's EU that gains more power. There's a lot of differences between countries within EU. Can you imagine the USA being united if they'd have 10 different official languages?