Yes, America has become more politically centralized but that's only socialism by Hayek's definition of it as centralization.
I don't think America could ever adopt Marxian socialism completely because it is at heart a liberal capitalistic democracy. I mean those terms in the most general way, liberal extending back to classical, capitalistic even in terms of big media, big banks, big tech, big business (big government), and still answerable to the people. What Louis Hartz in his 1955 The Liberal Tradition in America calls Americanism, a cross between Locke and Burke with no feudal past. Daniel Bell in his 1966 Marxian Socialism in the United States lays out the history of the periodic rise of socialism here compromised by business and government giving in to workers, giving them more than Marxist theorists could ever provide. We've also watched from a distance as all other national attempts ar socialism/communism have in the past and continue to fail miserably.