Germany invaded Poland in September 1939, beginning World War II, and Sage sailed back to the United States a month later. She immediately set up plans to help the Surrealists immigrate as well and establish themselves in the new country by means of art exhibitions—starting with Tanguy, who joined her in New York City in November. She arranged for Tanguy to have a solo show at the New York gallery of Pierre Matisse, son of the famous painter Henri Matisse, a month after he arrived. Sage had her own solo show, her first in the United States, at the same gallery in June 1940. Sage and Tanguy married on August 17, 1940, in Reno, Nevada, after he obtained a final divorce from duCroq.