Final answer:
The Crusades helped unify Europeans against a common enemy, fostering a negative image of non-Christians as enemies of Christian culture. However, the Crusades also had negative effects, such as the persecution of Jews and the growth of intolerance.
Step-by-step explanation:
Agree: The Crusades helped unify Europeans against a common enemy. The ideal of fighting against non-Christians was propagated by the popes, and generations of families made going on crusades a tradition. The conflicts also fostered a negative image of Muslims and Jewish people as enemies of Christian culture.
However, it is important to note that the Crusades had both positive and negative effects, including the persecution of Jews and the growth of intolerance.