In the 1600s, how did the use of indentured servants on the tobacco plantations in the new world increase the plantation owners' interest in using slaves?
a. the indentured servants were poor workers, and they thought that slaves would be better workers.
b. more people overseas wanted to come to the new world as slaves than as indentured servants.
c. they thought that slavery would be cheaper because indentured servants only worked for a few years.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.