Basketball is a much more approachable sport from a fan perspective. You can pick up the basics by just watching a few games. Football is far more complex and thus harder to pick up on for a foreign audience. Baseball is among the most complex games and pretty impossible to understand unless you were raised in a baseball following nation. There was a sportswriter who said if you don't understand baseball by the time you are 10, you never will. Similar to cricket, which is on obscure US TV channels, but really I cannot figure out the rules, and it's US/Canada fans are mostly South Asian or British Caribbean immigrants.

But US (And Canadian, they have a team in Toronto) baseball is followed closely in places like the Spanish Caribbean, Dutch Caribbean, parts of Central America, northern South America, and Japan and Taiwan, where most people can name many players. US baseball is also followed to a degree in Mexico, particularly the north, and has some followers among Dutch Caribbean immigrants in the Netherlands itself. You will see display ads in the stadium of some teams with Japanese players in Japanese, meaning some company has paid big $$ for an ad 99% of people can't read, that is how popular US baseball is in Japan.

The NFL is, by far, the most popular sport in the US, and that really is enough, but it plays games in Europe, Mexico, and most recently in Brazil. But football, of course, is played in a helmet and most of the players are linemen, who don't get a lot of love, even in the US, and most playing careers are much shorter than other sports. But quarterbacks, receivers, and running backs are well known in the US and I'm sure among the people, who show up to the foreign soil games the NFL plays.