Which of the following did not motivate U.S. foreign policy in Latin America during the 19th century?
A. Establishing a U.S. military presence in the region
B. Stopping the sale of opium in Latin American markets
C. Promoting U.S. economic interests in the region
D. Placing pro-U.S. leaders in Latin American governments
It would be "B. Stopping the sale of opium in Latin American markets," that did not motivate U.S. foreign policy in Latin America during the 19th century, since this was neither a foreign nor a domestic concern at the time.