The answer would be obeying the law. It is required in democracy, while volunteering, reading the news, and voting are not required.
Answer:
As famous as Marco Polo is, he didn't invent anything. However, other inventions such as the compass and the boat influenced Polo. Marco Polo used the compass on all of his travels but especially to reach Asia.
The upperclass were being captured by the native americans and so they eventually went to war
