Which was a result of Hernando de Soto's expedition through the Southeast? Select all that apply.
A)Hemando de Soto and almost half of his men died from such things as disease, exposure, and Indian attacks
B)Native Americans set up a new social hierarchy called chiefdoms to better protect themselves from European attack
C)Native Americans spread diseases, such as measles and chicken pox, to Spanish explorers
D)smallpox spread throughout the region killing about one-third of the Native American population