I stand by baseball being America's most popular sport, Baseball is considered as a "Pastime". But other sports are more about partying and getting together, such as football being a tv friendly sport, everyone in America is more of a football person but i think there Americans that still follow the game of Baseball still feel it to be more popular and watched worldwide.
football is by far the most populart sport in the us, hands down! it brings in the most revenue of all the three major sports by far. it is a juggernaut in terms of professional and collegiate terms. there are more and more athletic clothing companies investing more and more money into researching and developing gear for football equipment than any other sport, and football demands more money from ad companies than basketball or baseball
if you take a look at the championship games of all three of the major sports (baseball, basketball, football), the superbowl is the most marketable. companies pay by far the most money to develop and shoot commercials, and even more money just for a time slot. millions of americans tune in to see the superbowl because of the format. its a winner take all game. no best of three, best of five, or best of seven. the stakes are much higher during the superbowl, which makes the level of anticipation for a winner more higher, which draws in more viewers. people can miss a game of a world series or a NBA finals, but if you miss the suberbowl, you miss everything