The other thing about Baseball and Football attendance is Baseball teams play literally 10 times more games than football teams do (162 games vs 16). So the spectical aspect of a football game really boosts attendance.
Those pictures are a bit deceiving. The baseball picture is from Opening Day, which regularly gets a huge crowd in any city. The football pictures are from way before the game starts. If you look at the very first pic of the thread, you can get a better idea of the crowds that show up for baseball games there. Miami regularly draws some of the lowest crowds in all of baseball - honestly, I don't think they should even have a team, considering their attendances. Even in the years in which they won World Championships, they didn't draw good crowds during the regular season.
Miami is really misleading when it comes to judging nationwide popularity of sports. First off, it's not a huge sports town - it has a huge beach/party/clubs/etc. scene and for many people in South Florida, especially college-age kids that would go to sporting events in other cities, that takes precedence over sports. Secondly, their baseball team was formed in 1993, as compared to their football team, which has been there since 1960. Thus, the baseball team doesn't have as much of an established fanbase, and their ownership has been horrible, further curtailing their ability to draw crowds.
On a nationwide level, football is slightly more popular than baseball, although people from the South and Midwest often tend to exaggerate the difference between the two (likewise, a lot of people from the Northeast and the West Coast tend to underestimate the difference). Baseball is still the number one sport in the northeast and on the west coast, especially in New York City and Boston, where baseball dominates the headlines even during the offseason (I've seen deals made by the Yankees and Mets get more attention in NYC on the same day as Giants/Jets games in the middle of December). There's also parts of the Midwest where baseball still reigns king - for instance, Chicago is still a baseball town, especially on the North Side, where the Cubs are wildly popular. I've noticed that baseball generally has a greater popularity in bigger cities, or in mid-sized cities that have had baseball teams since the early 1900s, while football is more popular in areas with lots of college football teams, in the South (where college football is absolutely huge), and where baseball teams weren't established until the 1970s or 1990s. A lot of football's popularity is driven by college football, and the NFL has become the most popular league in America (and, when looking at it from solely that nation and not international attention given to a certain domestic league, the entire world - of course, when looking at it from an international perspective, the EPL, La Liga, Serie A, etc., are way ahead of any American sports league) largely due to gambling. It's basically impossible to gamble on baseball, considering each team plays 162 games per year, and almost always wins 60 of those games and loses 60 of those games. Even the best teams lose to the worst teams on a regular basis - it's bound to happen a few times when teams in the same division play each other 19 times per year. Likewise, baseball has different pitchers starting each game, so a bad team with a really good pitcher on the mound that day can beat a good team with a bad starting pitcher that day, while football keeps a constant starting lineup every game. Since baseball is neary impossible to bet on, outside of playoff results, while football is the easiest team sport in the US to bet on, gambling has increased the NFL's attention nationwide.
Still, baseball is still more popular than football in much of the nation, especially in the biggest cities (likewise, baseball tends to have way less popularity than football in rural areas). And given how it lasts throughout summer, is present every single day for 6 months (unlike football, which only happens one or two days a week for 4 months), and is much easier to play as a kid than football (hence why Little League baseball has so many players, while youth football doesn't have nearly as many), baseball is definitely a huge part of the fabric of this nation - moreso than any other sport can even dream to be.
It's almost impossible to judge which one is definitively more popular than the other. It all depends on one's definition of "popularity," the area in which one lives, and the importance of different factors than can contribute to "popularity."
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