Final answer:
The Crusades had negative effects, including the persecution of Jews and the growth of animosity between Christians and Muslims.
Step-by-step explanation:
The Crusades had several negative effects, including the persecution of Jews and the growth of Muslim-Christian hatred and intolerance. During the Crusades, Jews were classed with Muslims and labeled as the killers of Christ. This led to the expulsion of Jews from some kingdoms and heavy tributes imposed on them to stay. The Crusades also fueled animosity between Christians and Muslims, creating a lasting impact on relationships between these communities.