The 1860 civil conflict in mount Lebanon and Damascus
Several reasons.
Saw this crusade as a blessing from God.
Christians would stop fighting themselves.
Christians that would fight would go to heaven or be right with God.
To take back the holy lands, from the Muslims would be a righteous cause.
A. The 1848 discovery of gold in California
Pollution,pollution is spreading faster and faster by the moment.Surely later on in the future it will become a bigger and or worse problem.