Which statement best describes how the free states in the northwest acted regarding african americans?
a. they passed laws to encourage free african americans to enter the state.
b. they passed laws to discourage free african americans from leaving the state.
c. they passed laws to encourage slave owners to set slaves free.
d. they passed laws to discourage free african americans from entering the state.

Which of these would be most useful in studying the effect of germs exchanged between the new and old worlds? a. a graph showing the number of europeans between 1492 and 1600. b. a graph showing the number of native americans between 1492 and 1600. c. a primary source description of the symptoms of an unknown disease affecting native americans in 1492. o d. a primary source description of the symptoms of an unknown disease affecting europeans in 1492.