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Fix Michigan #899

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@alexcjohnson

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@alexcjohnson

Choropleths of US states - like https://plot.ly/~Dreamshot/8177/gun-control-google-search-volume-by-us-state-since-2004/ - draw states with their borders out in the great lakes. Which is where their jurisdictional borders are, but this is not so useful or meaningful to viewers.

screen shot 2016-09-02 at 12 01 58 pm

This looks OK at the national level (gives a seamless border between US and Canada) but not at the state level. We should use the land outlines. This will affect all the great lakes states a little bit (MN, WI, IL, IN, OH, PA, NY) but Michigan has a totally different shape and size if you include the lakes.

The docs show a workaround using showlakes but this shouldn't be necessary, and still doesn't look exactly as you'd want - for this type of map you shouldn't see the border lines out in the water, and there should be lines at the water's edge:

screen shot 2016-09-02 at 12 34 37 pm

Globally I only see one other place we could consider doing this: Lake Victoria (Uganda, Tanzania, Kenya) but it's still not as big a change to the countries involved, and searches for eg "Tanzania Outline" and "Africa Choropleth" show that people don't seem to care too much one way or the other (but I will defer to locals, if any would like to chime in)

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