After about 1830, most southerners came to look on slavery as a. a curse on their region. b. a necessary evil. c. a positive good. d. a threat to their social ideals.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)