Agree that evidence is appropriate, but as someone that's not in the US (NZ), we do broadly see it that way. US politics is very pervasive internationally, and you guys definitely appear to be split way more into 'left' and 'right' (as one example).
Compared to NZ's politics... which is more like a blob of parties which sit pretty close the centre, and sometimes parts of the blobs move more left or more right.
But naturally the dichotomy comment doesn't hold true in all circumstances.