Simply put, is there any pre-1900 AH topic that has been done to death in countless threads, to the point that 101% members agree that it's outright impossible, but the noobs keep bringing the topic again and again?
Somethings that crossed into my mind:
-Alexander the Great's successful conquest of India
-Continuous existence of Roman Republic
-Mongol conquest of Central and Western Europe (or India)
-Chinese colonization of America or Australia, or any other places
-Aztec or Inca victory over the Spanish (or other Europeans)
-Ottoman conquest of Holy Roman Empire, or Persia
-Napoleon's successful invasion of Russia (or Britain)
PS: If everyone's agree, maybe we can make a sticky thread that linking to the discussion threads about those topics