I don't understand your question.
Answer:
Aryans from central Asia invaded South Asia and introduced the caste system as a means of controlling the local populations.
Answer:
The byzantine empire struggled with low moral, corrupt leadership, bad politics, and excessive spending in the military
I hope that helps!
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.
