The US doesn't have the cards to play, because the current US Government doesn't even understand where the wealth has come from. That US Government has risen to power by tricking the public into thinking that the very things that make the US wealthy and powerful are actually a scam making them poorer.
The current US Government has already broken the trust that makes the US strong. The repercussions will take years to become fully visible, and without immediate course correction those future repercussions will get far far worse.
Literally a bang.
Or many bangs. The largest military in human history going YOLO won’t be a pretty sight. (The only way it sucks more in America than it does abroad is if we go civil war. But even then, it’s almost certain to go global.)
It won't.
This may be recency bias. The current age just has more immediate, global communications. "The sun never sets on the British empire" had a literal meaning based on how globalized it was then. They even laid intercontinental undersea cables.
Empires rise and fall, pax Americana was not the world's first hegemony. The end of the British Empire is within living memory - while they sowed seeds of instability in a handful of former colonies that still flare up today, the rest of the world is fine. Britain, on the other hand, has had to enter a "managed decline", and is a much smaller player in world politics than it was a century ago.