America came of age during the decline of empires and imperialism. America’s foray into the big leagues, the Panama Canal, the war with Spain, the Philippine conquest was brief and probably unavoidable. But we were the least harmful of the empires and the briefest. Is that what you’re referencing? I really thought our decline started with LBJ and The Great Society, the decline of black culture and Viet Nam. It has been greatly exacerbated by our current president and the descent of the Democratic party into communism.
See “The Progressive Era”. Teddy R/Woodrow W/Hoover, These “Men” Starting shoving the knife in.