What happened to Muhammad at the age of 5 or 6?

He grew up in the hill country, learning their pure Arabic. When Muhammad was five or six his mother took him to Yathrib, an oasis town a few hundred miles north of Mecca, to stay with relatives and visit his father's grave there. On the return journey, Amina took ill and died.

Explanation:

the decreasing neutrality of the u. s. in world war i

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