Inequality in the USA

Here are a series of animated GIFs showing economic inequality across the USA between 1977 and 2012. I admit: I don't understand these coefficients...so let's just assumes these economists know what they are doing. And, it that case, inequality certainly increased. But this is also a good example of the dangers of maps - sure the colors change towards more inequality, but that visual impression is also a function of map design, color choices, statistical classification systems, and break points.

http://i.imgur.com/EPa5zrO.gif