The answer is : The crusades.
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions — varying in size, strength and degree of success — occurred between 1096 and 1291.
The North and South were arguing over slavery. The South wanted slaves but the North didn't.
More books were produced more rapidly because they no longer had to be copied by hand, which lowered the price and made them more accessible.
