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The OP made this from scratch pixel by pixel in whatever image editing program he had. The map he used is developed by the alternatehistory.com community and is called the QBAM (quality big ass map). It is a world map including all national and subnational borders at this resolution. It also has sub sub-national borders for a couple dozen countries. Using these the OP combined and split these areas until he got the right areas he needed. Unfortunately even then he probably needed to approximate real-life borderless areas to be cut. The data would be dozens of lists of GDP for a ridiculous number of areas. The “shapefile” can be found as the blank QBAM under the QBAM improvement thread in the Maps & Graphics subforum at alternatehistory.com. This image is the only instance of these specific regions however.