I would have rather have seen just pulling in all of the values from an attribute into an array. This isn't very interesting since the top 3 are all from the same county.

You've done some good formatting here, but look into what's needed to get the tooltips formatted (esp the numbers) as well.

You only needed to create the chart for one of these examples. I'm not sure this one works -- you need to group the data by region and sum over the areas so that you get a single value per date.

population_percent isn't the best name -- since it's just the white population, you should include that in your name as well

This isn't just population percentage, but white population percentage -- it's an important detail on your data