The remarkable video below from EarthDirect is time-lapse animation showing every boundary change in American history for the continental United States and its predecessors: Colonies, states, territories, and even counties are included. As the months and years fly by in the upper right-hand corner, you’ll get quickly drawn in and then mesmerized by the increasing flurry of changes, which reflect an ever-expanding American population—though often, of course, at the expense of indigenous peoples.

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