Animated Map of the US
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We found this little gem on Chart Porn. It provides a neat visualization of the changing landscape of the United States since its inception. We agree with the folks at Chart Porn that adding timeline control would make this map really awesome (and a useful study aid for American history).
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If this chart had timeline pause/play control, it would be awesome. But, as is, it is basically useless because it goes too fast to be readable.