I think it might be the cutting back on military spending because of the economy.
Answer:
The Umayyad Caliphate was the second of the four major Arab caliphates established after the death of Muhammad. This caliphate was centered on the Umayyad dynasty, hailing from Mecca.
Explanation:
The Civil War in the United States began in 1861, after decades of simmering tensions between northern and southern states over slavery, states' rights and westward expansion. ... The War Between the States, as the Civil War was also known, ended in Confederate surrender in 1865.
Answer:
European found new products during the crusades.
