This description of farming in the Incan empire in 1539 was written by Garcilasco de la Vega. He was the son of an Incan princess and a Spanish explorer.
As soon as the Incan ruler had conquered any kingdom and set up his
government, he ordered that the farmland used to grow corn be extended.
For this purpose, he ordered irrigation channels to be constructed. The
engineers showed great cleverness and skill in supplying water for the crops,
since only scattered sections of the land could grow corn. For this reason,
they endeavored to increase its fertility as much as possible.
What engineering technique did de la Vega describe?

They developed resilient breeds of crops such as potatoes, quinoa and corn. They built cisterns and irrigation canals that snaked and angled down and around the mountains. And they cut terraces into the hillsides, progressively steeper, from the valleys up the slopes.Sep 6, 2011

Explanation:

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.