The answer is reason.
Philosophers of the Enlightenment believed that answer can be found
through reasoning. There were two types
of reasoning during that time. You have
rationalism that relies on deduction and Empiricism which deals with
experience. It took root due to the liberal atmosphere at the time.
More land, Lewis and Clarke went there, fertile land
The Parthenon is a (former and destroyed) temple in Athens, which is today a museum. It was built during the height of Athenian civilization and was dedicated to Athena.
The industrial revolution created more classes, not less. Therefore, arguments about larger gaps in social classes are difficult to support, Prior to the industrial revolution two main classes existed. The landed nobility and their poor farm workers.