"A nation cannot exist without shared values and a sense of common mission."
This is incredibly true and it is probably even in our constitution. Our nation's population has gotten so out-of-control, very few remember this to be the reason for our existence as a nation. Is everybody, just tired of being, a free country? Well, that same attitude may have existed in the tyrrannical societies we know today.
This phrase was in common use in the mill city in Massachusetts where I was born and raised and was used derogitoraly to describe anyone who wasn't amenable to assimilation.
It worked because there was a common understanding that assimilating was desirable.
Learning English was top priority for most new arrivals, because they understood the importance.
My grandmother's parents, from Germany, insisted their children speak only English, because "We're in America now."