Answer
Is a is shows the population density of an area
In the United States, both the President and the State Department are responsible for foreign policy, although most of these powers are delegated to the Secretary of States.
The European trade routes to the East changed from the land based system like the Silk Road into the sea based system that travels either westward or southward to east. This is because the lost of the trade routes in the land due to the conflict and wars forced the Europeans to create a new route through the sea and this is the time that theory the world is round is proven and is taken into consideration for making a new trade route.
