[paulpauper]

The question is whether the power and influence of the U.S. will grow similarly over the next 150 years as it has over the last 150.

It does not need to . What matters is how much profits large companies are earning. There is no indication that profits are slowing. Even if GDP only grows at 2%/year, if multinationals generate 10% annual profit margins, that is $ that must still go to investors even if GDP growth is much lower.

When you compare foreign markets to the US, the US still comes out ahead by almost every metric. There is little indication to suggest this will change. Every problem that the US has, other countries have worse. So relatively speaking ,the US still will be ahead.