What did the Spanish government's land grants include that caused hardship for American Indians, and what hardship did it cause?

Explorers brought horses, cattle, pigs, and grains such as barley and wheat to the Americas. Europeans took back such American plants as corn, tomatoes, tobacco, and cocoa.

Explanation:

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

i dont know but i need points