What economic data is he reading. Show me the data that says the South paid 75% of the taxes. Where is this wonderful data?
Feel free to read his books. He published the data. Do you think all the newspapers which said the same thing at the time were making it up too? Even the Northern newspapers which said the same? How about all the various commentators North, South and Foreign who said the same thing at the time? Were they all just making it up?