At first glance, this appears to be one of the most
ridiculous charts of all time. It is a charted record of top 20
population centers in the US since 1790. Really, you have to laugh
when you look at the thing.
Assignment: on the far right, there are,
indeed, 20 regions. How many different city/regions are
represented on this chart? You can click on this link for
the full article and help with the answer.
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