Positive: -It helped get western Europe out of feudalism -The Muslims were weakened by the Crusades even though they won and were not strong enough to take over the rest of western Europe. -Advancements in medicine (when the knights were in Arab and Persian nations they saw this advancements and brought it back to Western Europe) -This brought Western Europe with Eastern Europe and laid the start of the Renaissance -We gained knowledge of architecture, literature, and geography, medicine as we mentioned, and maths. Negative: -Many people were persecuted such as the Jews -Western Europe was unable to gain control of Jerusalem.