They can be prepared by being prepared
Because they were all Islamic empires, they all united. Even though some empires included other cultures, they all included Islam, which made them unite.
Explanation:
Americans living in big cities often blamed immigrants for moving into good housing, earning too much money, taking available jobs, and
taking available land.
Qin Shi Huang led the Chinese in the construction of the Great Wall of China
Hope that this was helpful :)