One of them discovered the mouth of the Mississippi.
Others of them stole Indians and carried them to the islands to work as slaves.

The most famous of them all was Cortez.

In 1519 he conquered Mexico after a thrilling campaign and found there great store of gold and silver.

This discovery led to more expeditions and to the exploration of the southern half of the United States.
[Sidenote: Coronado sets out from Mexico, 1540.] [Sidenote: The pueblo Indians.

_Source Book_, 6.] 13.