Just one opinion: there is no "legal binding authority" involved in this, so each one follows his own standard. Most of us, I think, use the criteron to include only states in which we have spent at least one night in our RV. That is the rule I follow, but certainly make no attempt to apply that rule to others.
I will try to find out where to download that map, but I'm sure I used "Photoshop Elements" to fill in the state colors. I'm also sure there are other programs that can do that.
I'll try to include "my map" here:

OK, I "cheated" one time. We drove across Iowa and had a reservation at Stone State Park. When we arrived there late afternoon, we found we could not stay in the site (and had an extremely difficult time even getting out.) We had to drive across the river to get a campsite in South Dakota. After all the trouble, I decided to include Iowa!
BTW, Washington and Oregon were the last two states we filled in.
I note on many such maps that North Dakota is often missing. We drove all the way across, West to East, and spent 3 nights in North Dakota a couple of years ago. Just an observation;)