Why were the europeans unable to use native americans as slaves

The belmont principle of beneficence requires that: a. subjects derive individual benefit from study participation.b. potential benefits justify the risks of harm.c. the study makes a significant contribution to generalizable knowledge.d. risks are managed so that they are no > minimal.

How long was it from the time african american men were given the right to vote until women were given the right to vote?

Anthropologist ralph linton said, "the last thing a fish would ever notice would be water." what does this imply about culture