I've long believed growing up rural and poor confers a survival advantage not replicable with training or gadgets. Coping with hard work, stress and scarcity aren't learned on weekends at a hobby retreat.
Aristotle warned of immigration in his treatise, Politics, of 350 BC. This is from Book 5, Chapter 3:
Another cause of revolution is difference of races which do not at once acquire a common spirit; for a state is not the growth of a day, any more than it grows out of a multitude brought together by accident. Hence the reception of strangers in colonies, either at the time of their foundation or afterwards, has generally produced revolution.
Daily Mail - Horrific New Year's Day assault on a female police officer in Paris was filmed by her attackers as they kicked her around like a rag doll ... escapees from Detroit or Baltimore perhaps
All Outdoor - Watch: How To Avoid Garand Thumb, Hickok45 gives a lesson ... includes video, 2m 55s [In military school we called them M-1 thumbs, same result though.] :)
Return of Kings - 38 Pictures That Show The Decline Of America Since The 1950s