[gasull]

this America empire is sailing into sunset, and has no way to pay its trillions of dollars back.

The US will be able to pay the trillions of dollars back. How? Just printing more dollars and using them to pay. The problem for the investors is that those dollars might not be worth it too much.

But this will be in many years. Right now US creditors don't want to dump the dollar because it would decrease the value of what they hold.

[stuffthatmatter]

Regarding the currency crash, actually you just need one country (i.e Russia) or a hedge fund dumping a large amount of dollars, forcing others to dump theirs as well in a speedy fashion (kinda like everybody rushing toward the fire exit when someone triggered an alarm)