Redbeard
Banned
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Well it would be a much more elitist and despotic world if the British crushed the Patriots quickly (and hence butterfly away French Revolution). Serfdom might even continue well into the 19th century in Continental Europe.
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You certainly have a point about the inspiration the young USA made for revolutionaries in Europe. The British crushing the revolutionaries in America would not basically change any of the things leading to the "old regimes" falling in the next decades, it might not even postpone it. Perhaps it would reinforce revolutionary volatility. In 19th century people being discontent with their lives and not at least lack of potential for improving could direct their hopes towards USA - going over there and having a new start - instead of trying out yet another rising against the Lords. If there is no such place to direct your hopes at, the times in Europe might become a lot more volatile - and who knows - good ole' Marx might have his successful revolution in the industrialised countries?! (Which is then crushed by the Counter-revolutionaries under the leadership of the Czar of Russia and the King of England