Borders and boundaries are porous, especially in the context of political revolutions. Historian Julian F. Dodson has uncovered the story of postrevolutionary Mexico's attempts to protect its northern border from various plots hatched by groups exiled in the United States. Such plots sought to overthrow the regime of President Plutarco El as Calles in the 1920s. These borderland battles were largely fought through espionage, pitting undercover agents...
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History