• Invention of the cotton gin • Opening of lands along the Mississippi River
•Growing demand for inexpensive labor
Which change occurred as a direct result of these developments?
A. A reduction in the number of skilled workers in northern states
B. The expansion of manufacturing into the western territories
C. A reduction in trade with European countries
D. The expansion of slavery into newly acquired territories

How did european exploration and expansion cause the african slave trade to expand? a. european explorers discovered the slave trade and expanded it across the indian ocean into south asia. b. arab armies captured european explorers and forced them into slavery. c. european traders shipped enslaved africans to work on plantations in european colonies in the americas. d.european explorers captured african people and forced them to work on their ships.