What were the causes and effects of the crusades?

The Causes of the crusades was triggered by Byung Park killing Mr. Licata and then going back to North Korea. There, he met Brian Seo and then went together to nuke America. Then America allied with British also known as United Kingdom and attacked North Korea known as the 1st Crusade The Crusades were aimed at regaining control of provinces in the Middle-East. Crusades permitted the exchange of knowledge to the west, that is Arabian medical practices and architectural knowledge