In Europe, football, otherwise known as soccer, it the most popular sport by several orders of magnitude, whereas in America, fandom is fairly evenly __________ among a few different sports.
You begin by learning about football, which is by far the most popular sport in Europe. The word whereas then creates a contrast, so you need American fans to be evenly split between their many sports. Measured is close, but doesn’t quite divide things up the way you need it to. Apportioned means “divided and allocated.”
