Advertising created demand for new products, thereby changing the buying habits of Americans.
The U.S. economy was growing more tied to other nations,
It greatly reduced the time required for ships traveling from the eastern to the western United States. It also saved travel time for ships of all nations. To get to either the Pacific or Atlantic oceans became a shorter trip than traveling around the southern tip of Argentina.
stability
African land was divided without regard
Asia and Africa.
The nations that received them did not fully accept them.