In Latin America, Wilson emulated his predecessors in sending soldiers to support U.S.-backed governments, but Hoover eventually wound down the "Banana Wars". The U.S. became involved in the Mexican Revolution during Wilson's presidency, and Mexico would remain a foreign policy issue throughout the 1920s. After the October Revolution, Wilson dispatched American soldiers to Russia in as part of a broader Allied intervention. Russia was succeeded by the Soviet Union in 1922, and the United States would refuse to extend diplomatic recognition to the Soviet Union until 1933.