How much of America’s growth since the 40s is attributable to its hegemony, stability, and the emergence of USD as the reserve currency of the world? And where other developed, stable nations started dropping in population, the US continued growing thanks to immigration and its center as a research Mecca.

All of those are being unwound as we speak, and it’ll take decades to prove to the world that any trade policy and government agreements may be kept longer than 4 years.

>growth since the 40s

The US growth trend has been fairly constant since the late 1800s. There's no real discontinuity in the trend around the time the US become hegemon.

https://upload.wikimedia.org/wikipedia/commons/0/01/GDP_per_...

Part of why Switzerland is so stable is because of its neutrality. Switzerland doesn't have to deal with Russia interfering in its elections the way the US does.

The US became the wealthiest country on a per capita income basis in the 1880’s, over taking the UK.

The US was quite isolationist up until the end of WW2, so I’d argue global hegemony isn’t that important when it comes to economic performance.