A&E Television
History.com: The States
Learn unique facts about each American state. You can also read a more in-depth history of each state, watch videos and play a game about all the states.
New York Times
New York Times: Crossword Puzzle: The Fifty States
The New York Times Learning Network presents an online crossword puzzle that you can print or play online. This one is on The Fifty States. Subject matter may be a bit deep for an elementary student to work on independently.