I was watching the news as the Taliban sweeps fledgling state Iraq, so recently “liberated” from the brutal dictator Saddam Hussein. Are they again to become a failed state due to their own religious factionalism, enslaved yet again by new opportunistic warlords?

“Worst case scenario,” I thought, “they’ll fall to a new dictatorship. But, how long do dictatorships really last? Since ancient Greece, Rome and Persia, I can’t remember a real dictatorship that made it to a hundred years.”

I soon realized, there IS a hair-splitting difference between a dictatorship and a totalitarian regime. Regimes, under a succession of dictators, such as the USSR, last under a century in modern times. And then we have “authoritarian regimes” in which some freedom is tolerated but rigidly monitored, all the way down to “benevolent dictatorships” and kingdoms such as Saudi Arabia, where the king is still head of state and nominally the final authority.

China, once one of the bloodiest dictatorships after millennia of emperors and the indignity of the British Opium Wars, seems at the time to be a special case. North Korea, with its three generations of hereditary Kim Jongs, is almost universally held to be one of the most brutal and detestable regimes, with each generation of “Dear Leader” being crazier than its predecessor.

And finally, we have that resurgent scourge of Huns, the terrorist armies, who, having seen territory they want, simply take them and execute the opposition.

How long do dictatorships last, on an average?

My guess for maximum longevity in recent times was about right. I did some research and analysis.

To make much sense of the conclusions of this piece, you really should first quickly peruse this list at Conservapedia.com “List of Dictators.”

Their website states “The following is a list of national leaders (heads of state and/or heads of government) commonly regarded as modern dictators.” The list is mind-boggling. Look at it. You can see some patterns that dovetail with what we remember of of history, but they don’t lend themselves to easy statistical analysis.

What I liked was that their list included dates dictators were in power. I wanted durations of their reigns over time.

What is their average, high and low reign as absolute ruler? Are there any patterns over time? Would it be fair to say dictatorships are today on the decline world-wide?

I exported their web table to an Excel spreadsheet, calculated each dictatorship’s term in power, and I tried to do some simple analysis. I graphed the most significant result: dictatorships are almost always short-lived aberrations, though frequently followed by new aberrations. I could see no particular evidence they are on the wane; what changes is where and when they sprout, like poison mushrooms after a rain.

I think you could make a case that chaos and authoritarian regimes flourish after an occupying power vacates, or is forced out of, a geographical area. But this is tough to prove. Given the scholarly difficulty of tracking down the history of every individual shifting country on the list, I didn’t try to quantify my conclusion.

I’d have liked to see graphed breakouts by region, and more by century or historical period, but in most cases it is easy enough to see those patterns in the Conservapedia listing.

I compiled my chart by counting the number of occurrences of 0 years, 1 year, 2 years and so on, all the way up to a 47 year maximum duration of power. There were 230 entries total. There were a few multiple entries representing multiple terms by the same despot. My graph only answers my original question, “How long do dictatorships last, on an average?”

No modern dictatorship ever lasted 100 years. I see no clear trend showing dictatorships are dwindling world-wide. The new hotspots are Africa and the Middle East. I found 220 distinct “modern dictators.”

You’ll find a graph of my “how long do they last?” results below.

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