This is one of the most interesting uses of a graphic to show how immigration patterns have changed over the years. Each dot represents 100 people. That so many people come to the U.S. is interesting enough, but what's truly interesting is watching the different patterns of where they come from.
I wonder how hard it would be to combine it with a US map showing population density over the same timeframe. In other words, start to show where all those folks are going...
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