The extended data set shown in the beginning of the Barro text comes from the Maddison Project. Angus Maddison was an economist whose life work was the creation of very long historical GDP series. The project is now part of the Groningen Growth and Development Centre at the University of Groningen in The Netherlands.Their data is free to download.
As of this semester, the data for the U.S. is annual, and has been extended back to 1820. These charts come from a spreadsheet saved to the class's shared Google Drive folder.
I am not certain, but I'm really sure that Barro got his data from the Maddison Project (there really aren't any competitors), and that probably at the time he downloaded it, it only went back to 1869.
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