If Latin America's public universities are considered part of the state, then it seems plausible to characterise them as similar to the state, i.e. as clientelistic. However, this plausible hypothesis has never been examined by the literature on twentieth-century Mexican social sciences. Just like clientelism, science patrons such as US philanthropic foundations have similarly been neglected. In this article I argue that, as an alternative to what the Rockefeller Foundation perceived as clientelism and amateurism at Latin American universities, it claimed to patronise liberal scholarship, practised according to formal rational criteria. While foundations have been frequently considered part of a US imperialistic drive towards cultural hegemony in Latin America, they were not unitary actors and frequently failed to predict the actual impact of their grants. In Mexico in the 1940s, the Rockefeller Foundation boosted the humanities, but missed the opportunity to support a local take on social science teaching and research.