NC is exactly right. For nearly a century England was #1, and the attempt to stay #1 caused England to commit disastrous foreign policy moves, like appeasement of Germany, refusal to go off the gold standard, staying in India far too long, and trying to govern Palestine. All because Queen Victoria said "I think it is unwise for us to give up what we hold." And the remarkable fact is that, ever since the British abandoned their Empire, the standard of living in England itself has actually improved dramatically.
That's what we need to be concerned with: standard of living for the American people. That does not mean isolation from world affairs; far from it. But it does mean that we don't need to get into any economic races with countries like China. So long as we trade freely we will enjoy prosperity, and that's what it's all about.