Aristotle was the first Greek philosopher to analyze how people can use reason to reach logical, provable conclusions.
I believe the answer is:
"We live our lives taking each second for granted. But what would you do if you knew how much time you had left?"
There was a large desire for slaves because these slaves didn't need to be paid, as long as they were fed, they would be able to work for any amount of time for next to no cost at all.
The Monroe Doctrine was introduced in 1823 and had a lot of fascinating points. Two of the major points were, Europe could not interfere with countries in the Americas and the United States could not interfere with Europe. This played a huge part in the Western Hemisphere as Presidents would always invoke the Doctrine during foreign affairs. The most recent example, President Reagan used the Monroe Doctrine to fight and stop communism in the Americas.