dictators- who was the worst of all ?what was the mistake going againt america ?

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having a look at d history we saw many dictators who came and left with nothing ,who wanted to be successful but turned out to be loosers, who wanted to rule the whole world finally lost even their closest relations. these dictators were accountable for innumerable deaths of many innocent peaople,children,caused widespread violence etc. there was hitler,saddam hussein and many more added to that who do think was the worst of all and why ,what do you think was the biggest mistake which they did is it killing people or going against america