Why did the Aztecs sacrifice human beings

to sum it up it was for Huitzilopochtli one of there gods

Explanation:

The rationale for Aztec human sacrifice was, first and foremost, a matter of survival. ... The keep the sun moving across the sky and preserve their very lives, the Aztecs had to feed Huitzilopochtli with human hearts and blood. More than 650 skulls

i think it would be reparing roads  

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.