No, they haven't. They spent the first decade after WW2 repairing the damage left behind by the Japanese and their Civil War. Subsequently they managed to starve tens of millions afterwards in several missteps, and then righted themselves.

They then spent three to four decades lifting about thrice the US population out of extreme abject poverty, and then in the last 20 years catching up. And catch up they have; they are already the leaders in green technology and EVs, already manufacture some of their own chips, already have indigenous military aerospace capability, which they are now expanding to civilian use. They make almost everything in the average household.