What did John C. Calhoun introduce that helped increase states' rights?

Using complete sentences, compare and contrast the leadership and accomplishments of martin luther king, jr. and frederick douglass.

In what way did expansion and global trade during the 15th to 18th centuries affect the economies of european countries?

Why did the crew of the zong ship throw some captive africans overboard? a. there was not enough space in the ship. b. the captives’ deaths were covered by insurance. c. the ship did not have adequate food. d. the ship did not have sufficient crew to care for the sick captives. e. the african captives rebelled against the crew.