Well, sure. The Roman Republic took about 400 years to go from a town to dominating the Mediterranean basin. It then was able to continue to dominate for another 600 years and was still able to stay relevant for another 200 years after that. So, it took roughly as long for the country to die as it was to be more or less built. The United States took about 150 years to go from Independence to a world power. Its been about 100 years since that has happen... so...
I think the lesson there is that we should not assume the US is about to lose its dominance. It could be dominant for a long time. On the other hand, there is good reason to think the US empire may not last hundreds of more years. Resource depeletion will likely be a huge factor. Renewables may not be able to sustain us at our current energy needs. Global warming could play a role as well. It might not be feasible for any country to be a dominant world power in the near future. Or solutions will be found and everything will work out great. We just don't know.
