Does nationalism always unify people? why or why not? (3 sentences)

Nationalism is positive because it serves as a uniting force. The recent World Cup united each country, where people came together as hopefuls for their team and, ultimately, their country. These fans were united in cheering for their players and equally united in recovering from defeat. This illustrates the resilience of national identity. By having a strong sense of who we are, shame and fright become foreign concepts. We become bold and confident, sometimes overly so.

Explanation:

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).