From the same reference, twelve out of 16 times that there has been a switch in which is the most militarily powerful country in the world, there has been war (though one should not take that literally for the current situation). China will likely become the most powerful (economically at least) in the next few decades, unless the US allows a lot more immigration.
From the same reference, twelve out of 16 times that there has been a switch in which is the most militarily powerful country in the world, there has been war (though one should not take that literally for the current situation). China will likely become the most powerful (economically at least) in the next few decades, unless the US allows a lot more immigration.