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The answer is Convention
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Answer: His main reason to travel was to go on a Hajj, or a Pilgrimage to Mecca, to fulfill the fifth pillar of Islam.. But his traveling went on for around 29 years and he covered about 75,000 miles visiting the equivalent of 44 modern countries which were then mostly under the governments of Muslim leaders of the World.
Explanation: hope it helps!
Hinduism is the world's oldest religion, according to many scholars, with roots and customs dating back more than 4,000 years.