Map from 1920

Last night I was cleaning out the attic and in the back of the closet was a large frame facing the wall. In it is a faded United States color map from 1920! I remember when I was a child my dad had this hanging in one of the upstairs bedrooms. I had no idea it was from 1920. The back of the frame is a piece of cardboard that used to be a cardboard box. My sister said to take off the back to see if there is a treasure map insde the frame. I didn't do that because I guess you can say there IS a "treasure map" inside. (Smiles). Have a fantastic day!