Emigrants are bolder, willing to take on more risk, more active and more appreciative of freedom than those staying behind.
General Patton already knew that.
From his letter to the Allied forces before they first stepped onto the European continent by landing on Sicily on 10 July 1943:
“When we land we will meet German and Italian soldiers whom it is our honor and privilege to attack and destroy.
Many of you have in your veins Italian and German blood, but remember that those ancestors of yours so loved freedom that they gave up home and country to cross the ocean in search of liberty. The ancestors of the people we shall kill lacked the courage to make such a sacrifice and remained as slaves.”
(Natürlich gibt es auch eine deutsche Übersetzung dieses historischen Zitats.)