I found this today, it’s pretty neat as a quick reference for genealogists or other people studying American history:
To see each frame broken down, go here:
http://gif-explode.com/?explode=http://i.imgur.com/yPov2.gif
Original source: https://en.wikipedia.org/wiki/Territorial_evolution_of_the_united_states
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The University of Richmond scanned a bunch of historical maps, georectified them, and posted them online here:
http://dsl.richmond.edu/historicalatlas/
This is a really great resource for genealogists or amateur historians, you can get a real sense at a glance about how politics, wars, population growth, etc. impacted different parts of the US.
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