The new constitution of 1917, with its threats to foreign property interests, was waiting only to be enforced. Britain's diplomats and consuls were called upon to negotiate with a government that periodically sought to recapture earlier concessions of land, railroad, mineral, and oil rights. Tensions led to a rupture of formal relations between Britain and Mexico from 1938 to 1947, but the volume of correspondence remained as high as ever. Official memoranda, dispatches, directives, reports, and cables are included, as well as incoming personal correspondence and official replies. These materials were originally filmed by the British Public Record Office for a consortium of libraries headed by Harvard University.
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