In 1930, IMM possessed 30 vessels. There were 19 in 1933 and only 11 by 1935. The ailing company merged with the Roosevelt Steamship Company, parent company of the Roosevelt Line, in 1931 to form Roosevelt International Mercantile Marine Company (RIMM). Later in 1931, RIMM acquired the financially troubled United States Lines and began consolidating its operations under that brand. The Atlantic Transport Line was dissolved in late 1931 and its ships were distributed throughout RIMM's remaining divisions. The American Line was merged into United States Lines in 1932, the Red Star Line was sold to Arnold Bernstein in 1934, Baltimore Mail Line merged into United States Lines in 1937, the Panama Pacific Line was dissolved in 1938 and its ships divested, and American Merchant Line was merged into United States Lines in 1938. Finally, the Roosevelt Line was merged into United States Lines in 1940, leaving that company as RIMM's only remaining business. RIMM changed its name to United States Lines Inc. in 1943, recasting itself as a smaller company focused exclusively on transatlantic routes under a single brand. Some businesses of the modern shipping industry still regard IMM as an early attempt at the corporate ownership of several companies under a single trust; the kind of large overseeing companies that dominate much of the maritime shipping world today. Company became United States Lines Inc, 1943