Coronado was known for the following. Your
•Mapping the American Southwest.
•Sailing and mapping the Gulf of Mexico.
•Conquering the Aztecs.
Returning to Mexico City in disgrace for failing to locate gold on his exploration.
•A and D.

A and D

Explanation:

the use of email to replace slower surface mail.

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.