Book excerpt: Becoming Campesinos argues that the formation of the campesino as both a political category and a cultural identity in Mexico was one of the most enduring legacies of the great revolutionary upheavals that began in 1910. The author maintains that the understanding of popular-class unity conveyed by the term campesino originated in the interaction of post-revolutionary ideologies and agrarian militancy during the 1920s and 1930s. The book uses oral histories, archival documents, and partisan newspapers to trace the history of one movement born of this dynamic—agrarismo in the state of Michoacán.