6. What did subjects have to do each year in Inca?

The Inca road was created by the people living in the Inca empire and subjects were required to do a certain amount of labor each year. The road was at least 14,000 miles long and runners ran on it to carry messages, as did traders and troops travel on the roads.

The U.S. has the largest navy in the world and is the country whose government invest the most into the military