In the Communist Manifesto, Marx and Engels wrote that “the history of all hitherto existing societies is the history of class struggles.” Today the story of American politics is the story of class struggles. It wasn’t supposed to be that way. We didn’t think we were divided into different classes. Neither did Marx.
America was an exception to Marx’s theory of social progress. By that theory, societies were supposed to move from feudalism to capitalism to communism. But the America of the 1850s, the most capitalist society around, was not turning communist.