If the US is not the most powerful country then who is? The US has the strongest economy and the strongest military. What other measure are you looking at? Even if you want to look at Europe as a single country then that would be debatable. UK just left and its looking like there is growing support for Spain and Poland to leave. It looks like the EU may be falling apart.
I think you need to look at individual US states vs the US as a whole. The federal government doesn't really have authority to do everything that other country's federal governments do. For example its generally accepted that the federal government cannot force every citizen to be in lockdown while the states can.
I think you need to look at individual US states vs the US as a whole. The federal government doesn't really have authority to do everything that other country's federal governments do. For example its generally accepted that the federal government cannot force every citizen to be in lockdown while the states can.