I grew up watching soccer. I can tell you most scores and events since Espana 82 to France 98 (I was in Paris for the final - a heck of an experience)
I was also a fan for many international sports you might not even know about them - like handball or volleyball.
Came to NA in 2000. Slowly stopped watching soccer over the years.
Had to like hockey (living in Montreal and all). Never could understand baseball - basketball is kinda meh.
American Football is now the top sport in my list, since watching a SB final with someone who explained me the details (hard to understand otherwise - did the same for some friends). It's the most complex and intense. Requires both extreme physical and intellectual qualities from every player and perfect coordination. Entertainment TV sport at it's best.
There are several weaknesses though that prevent American football to become more popular. Equipment costs a lot, you need a special field, its complicated. To play soccer you only need a ball (sometimes even that can be replaced). Soccer is played in every little corner of this world by millions.
Then the danger of injuries - I would not allow my son (lucky I only have girls) to play american football. Yes, I know there are injuries everywhere but still...
Third - the strenght of all NA sports is also their weakness - they are more sport shows than competition. Parity, no relegation. Players are mercenaries moving from on place to another.
An Euro soccer game, even between two cities becomes, a war. What happens on the field counts little - only victory. Nobody really cares about the entertainment level. If your team sucks - it will not get great draft picks in the name of "parity" - it gets relegated to the minor league. Then the top ones there get promoted. The owners of competing soccer clubs would never "discuss" anything with their competitors - they are at war.
TL DR - American Football is IMO the top in the Entertainment Sport Shows you have in NA. And it's the best sport to watch once you understand it. It is plagued though by being part of the show system.
However, as competition sports go, soccer offers a much wider and better experience.