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It reduced immigration from Southern and Eastern Europe and Asia, and admitted more people from Northern and Western Europe.

Explanation:

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there is an explationation of this on a site called crash   course world history 1

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.