Delaware benefited greatly from World War I because of the state's large gunpowder industry. The Du Pont Company, the most dominant business in the state by WWI, produced an estimated 40% of all gunpowder used by the Allies during the war. It produced nylon in the state after the war and began investments into General Motors. Additionally, the company invested heavily in the expansion of public schools in the state and colleges such as the University of Delaware in the 1910s and 1920s. This included primary and secondary schools for blacks and women. Delaware suffered less during the Great Depression than other states, but the depression spurred further migration from the rural south to urban areas.