GeaCron allows you to look at a map (based on area) at any time period (back to 3000 BC). Here are three screenshots of North America (starting in 1774, 100 years apart).
For the visual learners, this might be a great start to explore the many factors when countries are born (and also die). There is an app for this site (yet it is not free).
For the complete post from TeachersFirst, please click here.
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