How dominant USA would be in comparison to Brazil, France or Spain if their main sport is football?

Obviously, Brazil, France, Germany, and Spain have produced a lot of top players for their national team in the last few decades.

I was wondering how the powerful the USA would be if football (Soccer) is the most dominant sports in the USA, considering their economy and population? Imagine there's another world where the USA is on the same level as France, England, Germany, and Spain in term of talents production, league, coaching and player's dreams?