One reason that Islam spread so quickly is that its philosophy was captivating, progressive, and was considered extremely "modern" at the time. another reason it spread quickly is because of its large, and extremely adhering armies, its strategy, and its military might
Number 12 is C and D
Number 13 is Vietnam
Number 15 is Korea
Number 16 is the fall of the Berlin wall
Number 17 is D
Because It served as a center of religious, political, and artistic life for the Byzantine world and has provided us with many useful scholarly insights into the period. It was also an important site of Muslim worship after Sultan Mehmed II conquered Constantinople in 1453 and designated the structure a mosque.