Which nation implemented the encomienda system in its american colonies?

Spain

Explanation:

Spain adopted the Encomienda system in its American colonies during the 1500's  as the Conquistadores wanted a way to dominate their subjects.

This Encomiendas were prominent specially in Peru. The Spaniards venturers were given entire native communities at disposal of the Lords.

The Lord exchange labor and tribute for a supposed protection and education. Then we see that the system was more a mask for slavery and torture.

The encomiendas were used in Spain first during the reconquest, in the American continent Christopher Columbus handed out the first encomiendas to the newly arrived settlers, who together with the priests or officials shared large amounts of land. The lands stretched later to forme cities , towns that were often previously occupied by native communities.

The Encomienda System was the explotaition system used perhaps until the wars of Independence took place in the early 1800's.

slavery, abortion, donald trump, gay marriage, racial rights, immigration  

explanation:

anything that has been broth up to the supreme court is something of grate political divide   so just look as court cases