All those red ones are places I've visited in the US. Technically, I've been to Texas too, but that was when I was 3 mos old and so I don't remember it too well. I've only ever driven through Iowa and Nebraska, Ohio, Alabama, and Penn though. But I dunno, LOOONG hours in the car/bus sorta seem like you've visited there, so I count 'em. I've also put a foot or hand down in Arizona when we visited the four corners.
I'd do one of these for the whole world, but that map would be mostly Grey … I've only been to about 5 countries. create your own personalized map of the USA
or write about it on the open travel guide