I agree that America is doing many things wrong, and has many challenges facing it now and likely well into the future. However, I would also like to remind you that America is as a nation,
237 years old. It is a country that was founded by rebels and is often in some sort of crisis and or revolution at any given time. Despite(because of?) this, great things and great people consistently grow from here, and I have no doubt that will continue well into the future.
I am surprised when I hear people talk of our current issues as if they will be what does us in. Think of the big picture here, do you really think America is going to get "overtaken" in the 21st century when in many ways we are leading it? And I do agree we are behind in some ways as well, but we don't have to be number 1 at everything to be successful, or at the least survive and progress as a nation.