CLEP US History II

Answer: B - The Tampico Affair drew the United States into the Mexican Revolution, a 10-year internal armed conflict among various political factions in Mexico that lasted from 1910 to 1920. The United States tried to abstain from entering the conflict, but in 1914, when one of the factions encroached on the wealthy oil-drilling town of Tampico (where many American investors and prospectors were located), the United States had little choice but to temporarily enter the fray to protect their citizens and interests.