Why the hell are there so many Yankees fans in Louisiana?
Radio only had Yankees games on back in the ‘ole days. Braves were still in Milwaukee at that time.
Yankees seem to be the favorite team of places without obvious geographical loyalties, or maybe especially areas with no radio or television coverage of a team: Central Nebraska, Montana, Oklahoma, etc.
Be aware that this is based on Facebook followers, not necessarily actual fans. Lots of young black folks in Louisiana might dream of New York, for example.