The Crusades were a long series of wars between Christians and Muslims. They were both fighting over the control of Jerusalem, also known as the Holy Land because it was the region where Jesus had lived, preached and died.
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As the Crusades continued, the Christians had very little victories and but the King of England convinced the Turks to allow them to visit the Holy Land.
The Europeans learned many new inventions from the Muslims and the spread of ideas and an increase in the economy also increased.
European merchants and traders traveled across the Middle East and trade things such as tea, coffee, sugar, spices, silk, cotton, tobacco, and other goods, which increased Europe's economy.