Ah, it's another Sparks epoch. Last one was, what, 2006 on Cool Tools?
A Cleveland Museum of History mailing list post talks about what would have gone into producing such a map in the 1930s.
Rand McNally published several editions of each histomap over time, though none made many fundamental changes to the maps. New users can only put two links in a post; a Flickr search will do it.
If you like Sparks, you'll love Emma Willard's Temple of Time, a woman teaching girls 85 years earlier who kicked Sparks' ass but whose map is nearly ungooglable because of videogames.
Joseph Päringer's Gemälde der organischen Natur in ihrer Verbreitung auf der Erde companion is also great, though you may need to go to a museum to read the text on it as they weren't doing screen-friendly infographics back in the 1820s. New users can only put two links in a post, but the New York Botanical Gardens has a high-res image of it under the translated title Worldwide distribution of organic nature, as a press image for their Darwin Library Show.