Factually true, but this is like saying that history presents more examples of rotten teeth.

What is successful?

I think a form of governance is successful when it manages to serve the interests of the ones who are outside the establishment circle.

A royal family can rule for millennia a kingdom that grows smaller and smaller.

Persistence over time.

If we manage to blow up the earth and all life ends, a state that 'persists over time' will be created. Is this the ultimate success?

It does?

Yes.