(answer quickly! )
why did the native population decrease in the spanish colonies that were established in the americas? include at least three reasons.

1. The Indians became slaves, they were forced to work long hours for the new colonial masters in terrible conditions and were often treated with cruelty.

2. The Spanish brought with them new diseases for which the natives didn´t have any antibodies, so epidemies killed millions of people in the 16th century.

3. Numerous Indian populations were outrightly destroyed,  annihilated by the Spanish military during the conquest, for their resistance, during wars.

Explanation:

answer: an oligarchy is a political system in which the government is run by a group of noble families, or the elite wealthy members of a society. a present day oligarchic government is iran.

explanation:

use wikipedia, i think they have this.