principality of andorra

In the first two decades of the Cold War, the intelligence services of the West Block made some startling discoveries that hinted at an unexpected build-up of Soviet military capability, airlift capability, and even spaceflight capability. With spyplanes temporarily grounded due to certain...

Singapore, the Vatican, we need more city states! Where did we go wrong that prevented this from being the case? Let me know what scenarios you think could have led to the creation / survival of more city states. These can be realistic and/or creative, I just want more city states.