Yes, it is!!
No, but it is the most played sport (or popular) in the world.
baseball and soccer
Yes, it is the most popular sport in the US. But I would say that American Football, Baseball and Basketball are very close in popularity in the US. Football (soccer) is the most popular female sport in America, as well.
Football (soccer) is the most popular sport among American Latinos.
soccer baseball and football
Soccer is the single most popular sport in the world. Only in the US is it not followed with the fervor of most countries.
Soccer- worldwide Football- U.S.
It would probably be soccer, it is a VERY common sport and many people enjoy it. I play soccer and I also enjoy it.
Association Football (soccer in the US, football everywhere else)
Football (not American football. In the US it would be known as soccer)