American citizens consists of 100+ ethnicities, am I supposed to guess which one is it map about?

As the infographic says, breast size often corrolates with being fat. Americans are fat. Hence the dark color of the US on the map.

Thats not what my question was about. I asked which ethnicity in America has biggest breast size, since there is no “American” ethnicity, American is only a nationality.

This isn’t a map of ethnicities and breast size. It is a map of country and breast size. Pretty much all countries have multiple ethnicities. The fact that you bring up obesity at all is weird, since this is clearly just an obesity map with some random chaos mixed in.

If I were to guess the answer to your question, my guess would be obvious - black people, since being black corrolates with being poor, and being poor corrolates with being fat.