The Federalists (authoritarians/progressives/Democrats) started undermining it immediately, and have continued to do so to this day. What we have today doesn't really resemble the government we were founded on, and most of the changes have been for the worse. Even the ones I agree with, and there's quite a few, undermined the law of the land, and eroded individual liberty. So let's go through them and history.
Constitution : 7 items