Well, over the last 90 years the USA moved from important regional power to the economic and military hegemon of the world. That's quite the wave to be riding a

Well, over the last 90 years the USA moved from important regional power to the economic and military hegemon of the world. That's quite the wave to be riding as a US stock market investor. It's also quite a hard act to repeat. To maintain the historical growth rate, you have to believe one of the following two things, or some combination of them: 1. The US will continue to amass a larger share of the world's wealth, indefinitely. 2. The economy of the world at large will begin to also grow ~10% a year, a number far in excess of the historical average or any well-informed estimate. Personally, I wouldn't make that bet.