I think your second point is fine, but your first point comes across as condescending and needlessly pedantic. The meaning was clear enough.

Ah, ok. Looks like West Virginia also had 100% of counties go for Trump, so “only” is still not right, but at least that makes more sense.

OK had 66.2% vote for Trump. Idaho, North Dakota, West Virginia, and Wyoming were all higher than that.

So what do you mean by “only state” and “100%”? I’m confused by your comment.