While they are studying the maps, write down each team, with their individual names, on a slip of paper to be drawn from a basket. When it's time to play, you select the first team from the basket. One person from that team goes to the board and fill in ONE state name. If they are correct, they get a point. If not, no point.
Next team fills in a state.
Same thing, until ten states are filled in correctly. The random element is good, because the game might be dull at the beginning otherwise. It also varies the odds of winning, and keeps the kids on their toes. The second set of ten states are worth TWO points each. And so on, up to five points.