When did Islam start to spread rapidly and through what means did it extend its reach?

Islam spread quickly because the Islamic state was initially able to expand very quickly. Later, like other religions, Islam spread quickly through trade along the Silk Road in Central Asia and the sea routes in the Indian Ocean and SE Asia.

Explanation:

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the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.