It all started back in the 1900's, the Yankees just started to fight with the better team because they wanted to injure them, they knew they couldn't beat them so they tried to take them out.
Chat with our AI personalities
I don't know why the San Francisco Giants and the Los Angeles Dodgers are rivals but I do know that the Dodgers suck and the Giants rock.
Originally the Dodgers were in Brooklyn. Called the Brooklyn Dodgers. They were only a few miles away from the Bronx. I guess once they moved to LA, they still remained rivals.