If you remove tech companies, US and A has spent the last twenty years in stagnation, too. If that bubble bursts, both are on par.
If it bears fruits and we build ``it'', everyone dies, which is par, also?
A 'bubble bursting', if that happens, doesn't make the tech sector go to zero. Apple doesn't suddenly stop making iPhones. It would take a hell of a lot more than that for the US economy to fall to European levels.
Gemini says (20 years growth): - USA: 51% total, 27% without tech. - EU: 25% total, 21% without tech. - China: 345% total, 205% without tech.