Interesting .gif from Wikipedia:
Political boundaries in Australia, and their changes
I like using such .gifs in PowerPoints, just one more way to add some interest and a lot more information to a session of “direct instruction.” Do you know of other .gifs that could be used for U.S. history, or other history courses? Please list them in comments.
Especially let us know if you find errors in this one.
Or errors in this one, which covers deeper time:
History of Autralian political boundaries, from discovery by Europeans
Posted by Ed Darrell 
Millard Fillmore's Bathtub 