The kind of geography that deals with people and how they affect the world is Human Geography.
This branch of Geography approach systematically how humans shape the world they live in considering their spatial distribution on Earth and activities, addressing topics such as cultural geography, political geography, economic geography.
Athens was a direct democracy in which citizens voted on laws themselves. There are similarities and differences between Athenian democracy and that of the United States. In a democracy, the citizens make decisions. But the difference between the democracy of Athens and U.S. democracy today is that in Athens the people directly made the laws themselves.
Answer: People left the cities for the manors because of better farming technology