Most ridiculous chart of all time . . . . or is it?

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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