The USA, Japan, South Korea, Canada, and even Russia all had fairly successful nuclear power plant production businesses until they mostly stopped for political

The USA, Japan, South Korea, Canada, and even Russia all had fairly successful nuclear power plant production businesses until they mostly stopped for political reasons -- Areva (France), GE, Mitsubishi, AECL, KEPCO, Westinghouse, etc built reactors are all over the world. China is still doing mostly foreign reactor designs but they have at least two companies that will probably be able to build wholly China-sourced plants in the 2030s. Sadly most of those stopped when the production knowledge and training and organizational maturity was getting much better. Point being that multiple countries and companies had very successful nuclear power programs, and they didn't collapse because of intrinsic failure of the industry but lack of political will. And as you note, overall large-scale construction in the US in general has turned into a dumpster fire regardless of what is being built due to stupid policies and no small amount of graft.