Cohan appeared in 1930 in a revival of his tribute to vaudeville and his father, The Song and Dance Man. In 1932, Cohan starred in a dual role as a cold, corrupt politician and his charming, idealistic campaign double in the Hollywood musical film The Phantom President. The film co-starred Claudette Colbert and Jimmy Durante, with songs by Rodgers and Hart, and was released by Paramount Pictures. He appeared in some earlier silent films but he disliked Hollywood production methods and only made one other sound film, Gambling (1934), based on his own 1929 play and shot in New York City. A critic called Gambling a "stodgy adaptation of a definitely dated play directed in obsolete theatrical technique." It is considered a lost film.  Cohan earned acclaim as a serious actor in Eugene O'Neill's only comedy, Ah, Wilderness! (1933), and in the role of a song-and-dance President Franklin D. Roosevelt in Rodgers and Hart's musical I'd Rather Be Right (1937). The same year, he reunited with Harris to produce a play called Fulton of Oak Falls, starring Cohan. His final play, The Return of the Vagabond (1940), featured a young Celeste Holm in the cast.  In 1940, Judy Garland played the title role in a film version of his 1922 musical Little Nellie Kelly. Cohan's mystery play Seven Keys to Baldpate was first filmed in 1916 and has been remade seven times, most recently as House of Long Shadows (1983), starring Vincent Price. In 1942, a musical biopic of Cohan, Yankee Doodle Dandy, was released, and James Cagney's performance in the title role earned the Best Actor Academy Award. The film was privately screened for Cohan as he battled the last stages of abdominal cancer; Cohan's comment on Cagney's performance was, "My God, what an act to follow!" Cohan's 1920 play The Meanest Man in the World was filmed in 1943 with Jack Benny.

Answer this question "What was his most notable accomplishment in his later career?" by extracting the answer from the text above.
Cohan earned acclaim as a serious actor in Eugene O'Neill's only comedy, Ah, Wilderness! (1933),