It should be war, famine, and class struggles. I really hope this helps, let me know if you need clarification.
Marco Polo traveled during the middle ages (AP period 3), for this the communication technology was not very advanced and Western Europe didn't really know the situation of East Asia and vice versa. When Marco Polo explained his travels to the Europeans of the greatness of China many Europeans decided to go and see for themselves if this greatness was indeed true. When the Europeans arrived in China they were very impressed and a new promotion of travel to China emerged, INCREASING China's economy.
I believe it climate and landformations, Regions are usually made from Gerrymandering
Answer:
The root issue for the nullification crisis was:
B States wanted to nullify federal laws that they deemed unconstitutional
Explanation:
The Nullification crisis has its roots in the refusal to collect tariffs between 1828 and 1832 by the state of South Carolina.
