Ye Olde American Plutocracy
They also secured it against theocracy on the Federal level, with the only mention of religion in the original Constitution (the supreme law of the land—it says so itself) being its ban of "religious tests" for office (although that is hardly enough of course to stop modern-day Christian Theocrats from insisting that the US was founded as a "Christian Republic", the Christian Theocratic analog of an Islamic Republic).
But the "founding fathers" and framers of the US Constitution failed noticeably, miserably and completely to secure the Republic against just as vicious and unrelenting an enemy of republics as monarchy/aristocracy and theocracy, plutocracy:
Consider, for example, an American civil trial: On the one side we have Joe Blow, plaintiff, and his lawyer, Newgrad Yellowpage. On the other side, we have Mr. Joseph Bloviate IV, defendant; Mr. Bloviate's personal lawyers; Mr. Bloviate's family trust's lawyers; Mr. Bloviate's family trust's corporation's lawyers; and a pack of legal specialists hired specifically by Mr Bloviate's family trust's corporation's lawyers for the trial in question.
The American judiciary and legal profession absolutely consider this a level playing-field in law, and have from the first.
Keywords: American Bar Association, American Constitution, American legal "ethics", plutocracy