> Same reason for why Rome stopped expanding and had so many financial problems. The check on empire is always bankruptcy.
The down fall of every empire is hubris and corruption. It is what is bankrupting the US and what bankrupted the Romans. They stopped having kids, spent their time partying and tried to make up for it by importing and relying on barbarians.
2. Yes. But the state did not recognize the trap or simply did not care because it was not interested. I'm not exactly a historian, but Spain was somewhat known for having an inbred idiotic monarchy.
3. All of which are a result of an educated, effective elite and bureaucracy.
Competent leadership is the difference between El Salvador now and 10 years ago. It is the difference between Singapore and Malaysia. Both countries are a result of pure force of will of competent leadership.