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Read the book 'A Splendid Exchange' by William Bernstein.
http://www.amazon.com/gp/product/B00...0K5JM0E9BNNDTN
He talks of the incredible influence of the Portuguese on the world trade and 'how such a small country, coming out of the black plague, with a population of hardly one million' could set the standards for navigation, for commerce and for trade. Fascinating story, he dedicates quite a few pages to the Portuguese.
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