Final answer:
President Woodrow Wilson refused to intervene in the affairs of Mexico until Pancho Villa conducted raids into New Mexico.
Step-by-step explanation:
President Woodrow Wilson refused to intervene in the affairs of Mexico until Pancho Villa conducted raids into New Mexico. In March 1916, Villa and his forces attacked and burned the town of Columbus, resulting in the deaths of over one hundred people, including seventeen Americans. This prompted Wilson to send General John Pershing into Mexico to capture Villa and return him to the United States for trial. Wilson's decision to intervene was a response to direct aggression and a threat to American lives and property.