One factor that would make it possible is the decrease in the number of deaths, which could be a result of improved health care. In a country which a very low life expectancy in 1970 (50 years) an increase can be achieved easily with small health improvements and in fact it increased to 65 years since 1970s.
Well, if your asking about what were the main internal causes of Roman's Empire decline, it was because the Western Empire later separated from the wealthiest Eastern part and they also had trouble with outside invasions.
She was fearless, and crazier than him. she was his queen... and god help anyone who dared to disrespect his queen
