Final answer:
The Arabs helped spread Islam as it originated among them.
Step-by-step explanation:
The ethnic group that helped to spread Islam due to the fact that the religion was started among them is the Arabs. As the birthplace of Islam, the Arabian Peninsula played a significant role in the early spread of the religion. Arab traders, explorers, and conquerors carried Islam to various parts of the world, including North Africa, the Middle East, and parts of Europe and Asia.
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