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I understand. But my paragraph you have quoted was preceeded by ""The earliest known application of progressive taxation took place in Great Britain in the 14th century."" I couldn't leave it as that. World history on progressive taxation is very hard to find. You can find a lot on world history of taxation but not on progressive taxation. Therefore I added US history since it was available. Anyone else is of course free to add to it. - 173.74.164.212  "