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In case you have to check like I did, Kilwa is in present day Tanzania.

The Portuguese colonized the east African coast but were run off by the Arabs and Africans in the region. Intermarriages between Arabs and the local Bantu led to the creation of a new tribe, the Swahili

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It's more of the Portuguese Empire collapsed otherwise they'd still be around till today. FYI, the Arabs in question here were the Omani Sultanate who operated a gigantic slave trade on the East African coast.

Not commonly known, but the highest incidence of Arab genetic markers is in Yemen, followed closely by East Africa. Based only on genetics, an Ethiopian or Somali is much more Arab than an Egyptian, Syrian, or Iraqi. Although culturally speaking East Africa did not adopt/uphold Arabic language and culture as much as the Levant or Egypt.

It's a tangent but I always found it fascinating.

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