The late colonial period, especially after most of Europe made laws which prevented slavery to European countries overseas colonies started to drag more and more money from their pockets.
The American Revolution had a much less body count only because at that time no country, not even Britain, cloud supply enormous armies across oceans with adequate reliability so they cloud only muster limited forces and keep them in fighting condition. Also the French Revolution had many different fractions involved and usually fighting amongst themselves and the country was pretty much in the state of anarchy, while in the American Revolution we had those which wished free America against the British Crown. It should also be noted that at the time of the French Revolution France was the most populous European country while in all British North American colonies little over 2 million people lived at the time of the Revolutionary War.
If we actually take a good look no true "Communist" country existed on Earth in the way that Marx said a Communist country should look like - most were quick to dissolve into dictatorships or worse totalitarian regimes. But as for the mass murder - SFR Yugoslavia never had such thing (there was a brief period of increased imprisonments of political opponents but SFRY used death penalty in rare cases) - if it were not for the wish that Serbians that they had to have a supremacy over the rest of the republics in the Federation it might have continued to exist. Not that SFRY was perfect but considering Stalin's SSSR and the stuff in some other countries it was one of the best made "Communist" countries in history.
Religion formed from the natural need of the human mind for answers. Since at the time when most religions were created it was the human mind which used supernatural beings as being responsible as a replacement for an explanation for why for example thunders strike the Earth. So one cloud say that the habit of having a religion comes from those times when science cloud not provide answers to why some things happen. Again nobody is attacking religion did I not state what kind of Religious Organizations am I referring in my post?
I agree on that last point - but I am free to believe, as are you not to, that one day science, and I mean real science which only says something is confirmed when it can be repeated again and again in the same conditions, will give us all the answers that we seek including if incorporeal unicorns exist or not.