I don't think you'll come up with one.
How about Rome? We are following Rome's history quite well. It too was a Republic till it's Senators and bureaucrats became so corrupt they lost the support of the people...which led to the collapse and Caesar taking over.....which led to a long run of emperors, some good, some not so good, and some just downright horrible.
There are others and they all follow the same path, an energetic republic, followed by a load of idiots who feel they are entitled to the dole while producing nothing, then a revolution followed by an imperial run that then leads to ultimate collapse....and a start over with a period of anarchy etc.
You should read some history some time. You'll be amazed at what has happened before...many, many times before. Something you progressives seem to never be aware of... For someone who claims to be so smart..... you're really ignorant.