Robin Preiss Glasser's illustrations in Our 50 States: A Family Adventure Across America are playful and the pages are littered with tons of interesting nuggets of information. Since we didn't have time to read the whole book, my son choose a few of his favorite states to read up on. You could spend hours with this book!
The winner of our "Racin' Across the United States" game was the first player to get states colored in a path from one coast to the other or from the Atlantic to Pacific Ocean (or vice versa). It doesn't matter which states you "visited" along the way or in what order, so long as the states touched one another. Unfortunately, drawing Hawaii and Alaska from the bowl isn't much help.