From time to time, I still run into the online meme of the "end of empire" -- referring to the United States and its faltering dominance in the world. I have long challenged that premise.
The American Empire is by no means ending; if anything, it's been revitalized since the disintegration of the Soviet Union, and today the Imperial USA is as strong or stronger than it has ever been. It has shown itself to be remarkably adaptable to a changing world and has taken advantage of the changes to extend its influence, power and reach without necessarily putting more boots on the ground (though there is no lack of them).
What we've been seeing instead is the "end of the Republic" -- such as it was. It was a pretty anemic Republic all along, riven as it was with factionalism and dominated by the interests of money. Oh. Well.