Social welfare spending only goes up as percentage of GDP. https://ourworldindata.org/grapher/social-spending-oecd-long.... What data do you use to distinguish the "current economic system"? Notably of course, assuming the variations of the US system even mattered, the USSR collapsed after the 80ies (deregulation and liberalization having started even earlier under Carter, not after post war US economy stagnated in the 60ies-70ies.