PLEASE HELP What effect did the Columbian Exchange have on the use of slaves in the Americas?
A. The practice of slavery died out as a result of the Columbian Exchange.
B. The practice of slavery shifted to depend on Native Americans for free labor.
C. The practice of slavery was introduced as a result of the Columbian Exchange.
D. The practice of slavery spread anad increased as a result of the Columbian Exchange.

Which statement best evaluates the impact of the 1929 stock market crash on europe? 1. the united states established high export tariffs to europe that reduced goods exported to germany. 2. the united states promoted domestic policy initiates that reduced jobs on american bases in europe. 3. the united states promoted isolationism that withdrew troops from europe causing germany to pay its own national defense. 4. the united states eliminated loans to europe that caused germany to default on its reparation payments to france.

1. what was the purpose of the communist international organization?

Why is it important that dr. luther king jr. use non-violent protest to create social change?