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We examine trends in intergenerational educational mobility throughout the 20th century in Denmark. We demonstrate that major reforms in compulsory schooling substantially increased not only the levels of education but also intergenerational mobility in education for children born in the 1940s through to the 1960s. However, even as college education has expanded significantly for children born in the 1970s and 1980s, educational mobility has been declining. We empirically test different mechanisms that could account for this decline in educational mobility.