The basic problem with the US will prove to be that growth at all costs eventually has limits. We are like bacteria racing across the petri dish and the edge is getting quite close.

Much of this growth over the last few generations has been fueled by debt and debt doesn't matter, until it does. At some point the dollar will implode and the states will be the next line of civil authority, so they will have to start issuing currencies. Then foreign policy goes to be between Texas and California, etc. not the US and the rest.

When the ecosystem collapses, the top predators are more vulnerable than the little critters in the bushes.