>>14864428You don't know what you're talking about. O- makes up 13% of hospital requests because it can be given to any other blood type. O- is less than 10% of the population. It has never been the most "popular". You're thinking of O+. Papers going back to 1999 show that O was overall the highest distribution of blood types.
There's no Mandela effect here; you're just ignorant. This is the case with many claimed examples of the Mandela effect.