I think you would enjoy the book, America Alone by Mark Steyn. He makes very much the argument you make and he provides all sorts of statistics, polls, and other evidence that really turns the argument from theoretical to scientific.
In other words, once you are done reading the book, what you are saying won’t merely be right because it makes sense to you, but rather, it will be right because there is scientific evidence backing up your theory.
Already read it! Thanks. Maybe that’s where the ideas came from.