Alexander accomplished the goal his father was unable to reach by invading the Persian Empire
I believe the answer is: Interaction between people
Simmel focused his life on researchers to study different type of social interaction that people do with one another. He consider things such as psychology, economics, culture, and sociology as crucial factors that motivate people to interact with one another.
Answer:
lack of infrastructure in poor communities, affects the lives of poor people living around the community, such as lack of health facilities, some people loot medication needed by people and the government fails to bring resources to the one in need because of looting/unrest
The silk road was one of the only ways to get goods from other countries in that time period. People traded food, spices, skills, etc. With the trade, countries could try new cultures leading to the spread of cultures.