When did muhhamad began to teach people about islam?

around 610 ce(40 years old)

he started meeting the angel jibreel and started preaching secretly to family and friends 613 was when he went publicly in his tribe

however when he started preaching completely publicly like in cities and far away tribes was in 622

this is true hope this

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the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.