The British Empire lasted over 300 years. America as an Empire has been around for only around 100. The American Empire is like the British Empire squared because of its endless capacity for self-renewal. It's like a starfish that regenerates limbs. One of the things that makes it so dynamic is the great universities and their relationship with business. No Chinese university is even in the top 200 in the world. Of the world's top 20 universities, all but three are American. Of the top 50, all but 11 are in the U.S. And then you think about a concept like the "new economy". It's an American invention. Most of the best startups and the best software are made in America. In just about every measure of soft power, nobody compares.