A united earth would fuck the united states. Changing the world currency would crush us and while you would have a huge shock of military might. Sanctions and no allies would drain the united states pretty fast. Remember, we don’t have the manufacturing capabilities to isolate and keep up a war machine. We would have to convert every single manufacturing company into wartime production. Which wouldn’t hold a candle to the world capabilities. Stop selling shit to the US. A united Earth changes currency standards and the US falls quick.