Because it could be a dead give away to if someone is in danger around you.
U.S. President Abraham Lincoln
Napoleon thought it was too difficult to defend. He also needed the money.
The Nullification Crisis was a sectional crisis in 1832–1833, around the time of when Andrew Jackson was president, which has involved a confrontation between South Carolina and the federal government.<span />
The reason and cause of the crusades was a war between Christians and Moslems which centered around the city of Jerusalem and the Holy places of Palestine. The City of Jerusalem held a Holy significance to the Christian religion. Two major effects of the Crusades were that the kings' authority increased and the Europeans learned about new things from the Muslims they encountered. During the Crusades, the kings increased taxes to fund the cause. Many peasants also left their land to fight, and when they died, the land went to the king.