I'm no sociology expert, but it seems to me that the most innovative societies are ones where the children set out to build something for themselves and reduce their dependency on family. This is not to say that they don't love their family, but there is an expectation to put their God given talents to work to better themselves and build something lasting, even start a new family.
I have relatives who live in the southern part of Texas, Hildago county, just north of the border. Most of them have lived there their entire lives, and do not have a spirit of adventure to seek out the world. Close knit families are great, but they do increase the risk that your environment remains insulated.
The wonderful American tendency to pick up and move, in search of wealth, fame, or adventure is one of the things that makes this country great. Without Lewis and Clark, the homesteaders, the '49ers, those who sought to build the trans-continental railroad, and those who suffered hardship to even land on our shores by boat (legally), this country would look much different.
There was a thread recently that made an important observation. As I don't remember it verbatim, I'll paraphrase: A country's greatness is defined by it's people, not its resources, or borders. America is a great country because of great people.
This is NOT negotiable!
I don't know whether to laugh or cry at that. I live in LA, and I don't know any gringos who kick their kids out at 18. It would be impossible. Rents are so high here, due to the illegal invasion, that I know "kids" in their 30s and even 40s who are still living at home, or their parents are helping them to pay their rent. The average rent for a one-bedroom is $1,400-$1,500. Sure, the illegals can afford that...just crowd six or more people in one unit. My own apartment building has had a vacancy for months. When I asked the manager why, he said everybody who applies want to put six people in each bedroom, and thank God, my apartment manager refuses to disobey the law.
The days of American kids being able to strike out on their own at 18, getting their own apartments, are over.