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How did Vasco da Gama force the ruler of Kilwa to submit to Portugal?

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During his second voyage to India in 1502, Vasco da Gama forced the ruler of Kilwa, the amÄ«r IbrāhÄ«m, to submit to Portugal by threatening to burn the city. The amÄ«r had previously been unfriendly toward the Portuguese explorer Pedro Ɓlvares Cabral. Faced with da Gama’s ultimatum, the amÄ«r agreed to submit to the Portuguese and swore loyalty to King Manuel I.1