The spread of islam to Africa, Asia, and Europe has resulted in

Islam's history on the African continent is rich, more than a millenium of expansion, scholarship, conquest, empire and theological development. ... The historial impact of Islam upon trade, particularly in West Africa, greatly increased the wealth of African people and helped form many great African empires.

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.