Why European superpowers can't use divide and conquer among themselves like the rest of the world?

This claim is BS especially since the Ottomans used divide and conquer on Eastern Europe why Britain, France, and Spain could never successfully imitate the policy of the Ottomans. Also backwards people have a a tradition of using divide and conquer such as Mongols disrupting relations between various Chinese states, Ottomans turning Muslim nations against each others, and Japan using divide and conquer when they tried to conquer Korea by siding with one Korean aristocrat.

Not to mention the American Revolution, Britain tried to use this but it failed.
So the Hundred Years War is BS, as is the 30 Years War, the War of the Austrian Succession, etc etc?
Just because familiarity meant divide & conquer tactics BECAME less successful in Europe it does not mean it didn't happen!

I also think you need to explain what you mean by "backwards people" as use of it sounds like you subscribe to some kind of racial theory as to why Europeans succeeded first rather than luck of geography and timing.
 
France merrily played divide and conquer to the Holy Roman Empire, for the best of three centuries, whenever the chance to do that arose. Supporting separatism in neighbouring countries for your own ends is a tried and tested foreign policy strategy that has been seen many times in Europe, most recently by Russian policy in Ukraine. The Austrian Empire also used ethnic divides extensively to keep control of various of its provinces. It ultimately backfired horribly (just like similar colonial strategies did not work forever) but lasted for quite a while.
The most common divides used in the Modern Era for this, however, tended to be religious (Germany especially, but also France during the Hugenot Wars, in which the Spanish were extensively involved). Supporting different political faction or geographical groups was also a very, very common strategy in a number of power struggles involving Italy. And both France and the Anti-Bourbon Grand Alliance did, at different times, try repeatedly to exploit Catalan feelings of distinctiveness vs. the rest of Spain (which did not end very well for Catalonia). So it happened in Europe, but the context was very different for other reasons.
 
During WWI, the Allies did it against Austria-Hungary, and Germans against the Russian Empire.

During WWII, Hitler managed to avoid a two front war by dividing his enemies, separating Soviets from Anglo-French. Then the Nazis used this tactic in Yugoslavia (with Croats) and Soviet Union (seducing some Ukrainians, Balts...).
 
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