The repeal the 19th meme is funny but now I'm not sure that is as much of a problem.
The property requirement meant that only those with skin in the game were the ones who got to decide who governed. Without it we have paupers and indolents with the power to spend money that they did not earn or pay.
That inevitably leads to the death spiral from the famous quote:
A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship.
Obviously no political movement can form based on this principle since our current "conservatives" are too spineless to even fight for voter ID requirements. But at least it is within the overton window allowing for public discussion.
It is not one thing that killed the republic
It is a combination of multiple factors
The rise of corporatism
Regulatory capture of all the bureaucracies
Unelected bureaucrats have too much power
Education system taken over by radical leftists and creation of the woke
Corporate media propaganda
The expansion of the welfare state
Pushing of identity politics
Non property owners voting
Youth voting
Women voting