The Wealth of Nations by Part 4 Chapter 7 Page 163

other countries than to make for themselves. It is chiefly by encouraging the manufactures of Europe that the colony trade indirectly encourages its agriculture. The manufactures of Europe, to whom that trade gives employment, constitute a new market for the produce of the land; and the most advantageous of all markets, the home market for the corn and cattle, for the bread and butcher’s meat of Europe, is thus greatly extended by means of the trade to America.

But that the monopoly of the trade of populous and thriving colonies is not alone sufficient to establish, or even to maintain manufactures in any country, the examples of Spain and Portugal sufficiently demonstrate. Spain and Portugal were manufacturing countries before they had any considerable colonies.

Since they had the