The Age of Exploration: Chapter 6, Exercise 1 — Possible Solution
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THEORY
The Crown granted encomenderos the right to extract labour and tribute from
indigenous communities; in return they were supposed to provide protection
and instruction in Catholicism and the Spanish language.

PRACTICE
Conditions resembled forced labour and slavery.

REFORM DATES
The Laws of Burgos (1512 to 1513) and the New Laws (1542).

CAUTION
The source does not say how far the reforms were enforced.