All of them. "Height of their power" is a retrospective take.
Doesn't mean their death was by suicide, though.
Lots of them, though it's usually through unwinnable wars. See Kaiser Willhelm II, Napoleon, Imperial Japan, etc.
Is it is really Trump holding a 'box cutter' to America's throat, or is it a 'controlled demolition' of an "empire" that presents obstacles for a grand plan for the future of global governance ..
[p.s. bravo to the one who downvoted as soon as I hit submit! Wow, that was quick. Bots on HN?]
It is not a suicide.
We are in a global war, and US and the west is taking damage.