Final answer:
President Woodrow Wilson sent American forces into Mexico to pursue Francisco 'Pancho' Villa because Villa had raided a village in New Mexico and killed Americans.
Step-by-step explanation:
President Woodrow Wilson sent American forces into Mexico to pursue Francisco 'Pancho' Villa because Villa had raided a village in New Mexico and killed Americans. In March 1916, Villa led a force that attacked and burned the town of Columbus, resulting in the death of seventeen Americans. As a response, Wilson sent General John Pershing into Mexico to capture Villa and bring him to the United States for trial.