Fossil fuel are cheap and easy to use, but pollute the earth so no we shouldn't use it, and we should work on greener sources of energy that can power a nation! (Still not there yet though.)
Answer:
They made people work on its building projects and farmland.
Explanation:
The Incas created a working system that every person had to contribute to. If they did not contribute or were lazy, they could be put to death.
Very easy gravity is strong from the universe.
To push the enslaved to produce more crops. to render the enslaved powerless as to not revolt. to provoke fear in the enslaved to repay their cost. to harden the enslaved and ready them for auction.