Why did the Indians who had been ruled by the Aztecs join up with Cortez?

What is the main idea of this excerpt? 1.1.3

The impeachment of president clinton by the u.s. house of representatives occurred with a. virtually all republicans supporting it, while virtually all democrats opposed it b. about two-thirds of republicans supporting it and about two-thirds of democrats opposing it c. half of all democrats and half of all republicans supporting it, while half of all democrats and half of all republicans opposed it d. virtually all democrats supporting it, while virtually all republicans opposed it

Which is not an abundant natural resource found in africa?