How were Charles Darwin, Karl Marx, and Sigmund Freud similar? And if they weren't similar, why not?

The national security act of 1947 reflected:

The massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.

Plz which of the following spanish conquistadors did not explore large parts of what is now the united states? a. juan ponce de leon. b. hernando cortés. c. hernando de soto. d. francisco coronado.