The Wealth of Nations by Part 4 Chapter 7 Page 13

contrary to the clearest evidence. In his letters to Ferdinand and Isabella he called the countries which he had discovered the Indies. He entertained no doubt but that they were the extremity of those which had been described by Marco Polo, and that they were not very distant from the Ganges, or from the countries which had been conquered by Alexander. Even when at last convinced that they were different, he still flattered himself that those rich countries were at no great distance, and, in a subsequent voyage, accordingly, went in quest of them along the coast of Terra Firma, and towards the Isthmus of Darien.

In consequence of this mistake of Columbus, the name of the Indies has stuck to those unfortunate countries ever since; and when it was at last clearly discovered that the new were altogether different from the