Sandboxes aren't the real problem to begin with?

The idea proponents have is, to use "superhuman intelligence" AI as a tool, bestowing superhuman abilities on those wielding it. Suppose that's doable, then the question isn't the sandbox, it's who controls it and with what intent.

The idea, US exceptionalism somehow enabled the US government, its oligarchy corporations and maybe its citizens, to wield those superhuman powers responsibly is entirely counterfactual.

Pax Americana post-singularity looks how exactly?