Why were Arab settlers particularly influential along the Swahili coast?

The answer to the question above is: The Arab settlers were particularly influential along Swahili coast because the Omani Arabs were dominant in the area and were also taking the political power between 1840 to 1861. The Sultanate of Oman was moved to the island of Zanzibar.

Arab settlers traveled by East African seaports and exercised market trade along the coast Swahili.