In 1966, after several meetings with Secretary of the Interior Stewart Udall, Mrs. Shouse donated of Wolf Trap land, in addition to from the American Symphony Orchestra League, to the U.S. Government, a donation Congress subsequently accepted that year. In a letter to Congress that year, Udall argued that Wolf Trap would "augment the park and recreation opportunities in the National Capital region and involve the expenditure of only a minimum of Federal funds." On May 28, 1966, Virginia Senator A. Willis Robertson introduced a bill to Congress to create and fund Wolf Trap, which passed with relative ease. Mrs. Shouse also offered over $2 million to construct the Filene Center for performances.