They were both trying to achieve world peace.
The Last of the Mohicans is set in 1757, during the French and Indian War (the Seven Years' War), when France and Great Britain battled for control of North America
The reason is that there is a water shortage happening there. They needed to conserve water and be supplied from sources. Right now there are strict measures in the use of water in that area to ensure that it does not go to waste.
Too much can cause global warming