In the period since 1900, scientific and technological advances have increased economic productivity in human societies around the world. Develop an argument that evaluates the extent to which scientific and technological advances have allowed states to expand their economic power in this period.

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.