It's logically implied by your words, "the US _seems_ like it is more obese." (Emphasis added.)
"Seems", as in "appears to be, but is not actually." The only way the US is not actually more obese is if Hispanics and Blacks do not count as "the US".
The only other way to read "seems" here is in the "I'm not totally sure, but this is what it looks like" sense. But this doesn't seem to be the way you're using this word, especially given that your entire comment is denying that the US is more obese purely in virtue of white obesity statistics.