Everybody else seems to be doing it, so I guess I may as well too.
These are the states to which I have been (I think – We drove to Seattle once when I was a young kid, and I’m not 100% about which states we passed through. Some of those holes over in the west should maybe be red):
create your own visited states map
or write about it on the open travel guide
Grown-ups never understand anything for themselves, and it is tiresome for children to be always and forever explaining things to them.