The correct answer to this open question is the following.
The two reasons why the Crusades were significant to the future of Europe were the following.
1) Many of the people that participated in the Crusades sold their property to churches or their families. Some families invested in these lands and produced goods that later were an important component of the trade with the Middle East and Asian nations.
2) The Christian presence in the Middle East lands. Religious orders such as the Dominicans and the Franciscans extended its presence in the Middle East region to evangelize people in the Christian religion. Many times these orders traveled with Italian merchants to Asian lands.