What are 3 main causes and 3 main effects of the crusades?

Although the central purpose of the Crusades was to get the charge of Jerusalem off from the Muslims, there were several causes why European knights and others were prepared to go and confront a combat in a different land.

Although the crusades abandoned to seize Jerusalem, they had numerous significant influences on Western Europe.

"tear down this wall! " is a line from a speech made by u.s. president ronald reagan in west berlin on friday, june 12, 1987, calling for the leader of the soviet union, mikhail gorbachev, to open up the barrier which had divided west and east berlin since 1961.

lewis and clark (i think)