I get that collapse is a slow ongoing process but when the history books are written, what do you think will be considered the US' own Battle of Ravenna? What will occur that historians can point to it and say, "this was the effective end of the American empire." ?
It'll probably be a seemingly inconsequential moment in its foreign policy where it is suddenly incapable of carrying out or maintaining a foreign policy decision that in the 60s or even the 90s would've been a no-brainer walk in the park to achieve but that it is unable or unwilling to do in its contemporary state. It can be something as simple as allowing one of its vassal states to remove US troops/bases from its territory or catastrophically bungling a coup ( a real, actual coup, not sending three guys into Venezuela).
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