in the 20th Century, in the face of the growing relative inequality of wealth, a theory of Modern Liberalism (or New Liberalism or Social Liberalism) was developed to described how a government could intervene in the economy to protect liberty while still avoiding Socialism. Among others, John Dewey, John Maynard Keynes (1883 - 1946), Franklin D. Roosevelt (1882 - 1945) and John Kenneth Galbraith (1908 - 2006) can be singled out as instrumental in this respect. Other liberals, including Friedrich Hayek (1899 - 1992), Milton Friedman (1912 - 2006), and Ludwig von Mises (1881 - 1973), argued that phenomena such as the Great Depression of the 1930's and the rise of Totalitarian dictatorships were not a result of "laissez-faire" Capitalism at all, but a result of too much government intervention and regulation on the market.