Populism has been dominant in Latin American politics since the 1930s and 1940s, being far more prevalent there than in Europe. Mudde and Rovira Kaltwasser noted that the region has the world's "most enduring and prevalent populist tradition". They suggested that this was the case because it was a region with a long tradition of democratic governance and free elections, but with high rates of socio-economic inequality, generating widespread resentments that politicians can articulate through populism. March instead thought that it was the important role of "catch-all parties and prominent personalities" in Latin American politics which had made populism more common.