Education had always been a key factor in the nation's development, with liberals enshrining secular, public education in the Constitution of 1857 and the Constitution of 1917 to exclude and counter the Roman Catholic Church from its long-standing role in education. Cárdenas founded the Instituto Politécnico Nacional in 1936 in northern Mexico City, to train professional scientists and engineers to forward Mexico's economic development. The National Autonomous University of Mexico traditionally trained lawyers and doctors, and in its colonial incarnation, it was a religiously affiliated university. UNAM has continued to be the main university for aspiring politicians to attend, at least as undergraduates, but the National Polytechnic Institute marked a significant step in reforming Mexican higher education.