What contribution did the flying tigers make in world war ii? a. they served as part of china's volunteer air force. b. they flew supply missions across the atlantic ocean. c. they escorted and defended heavy bombers in europe. d. they protected the soviet union in the early days of the war.

What was one reason that southern states passed laws after 1800 to discourage manumission? 1)southern whites feared that freed blacks would seek revenge for past treatment as slaves. 2) northern leaders pressured southerners to liberate enslaved people. 3)southern states needed an inexpensive labor force to work in southern factories. 4)northern whites had sold their slaves to southerners before slavery was banned in the north.