No America is not backsliding into feudalism. There have literally been company towns where people were paid in script, there have been black lists to prevent people from moving jobs, there have been agreements between companies to not hire each others workers. None of it threw the country back into pre-capitalism. Even if somehow some sort of feudal arrangement emerged in America (which would require legal protection for a class of nobles, not just a group of people who are defacto protected by their money) then capitalists outside America would be able to out compete the feudalists and force open American markets once again. This is all just capitalism in new forms. This happens at least once every generation and then will happen again and again unless socialism is achieved. That's why Marx defined capitalism as the contradiction of bourgeois social relations and industrial forces of production and not as like idk when there are really powerful rich people who can force poor people to do stuff.