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In page Green Revolution:

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Mexico was the recipient of knowledge and technology of the Green Revolution, and it was an active participant with financial supports from the government for agriculture and Mexican agronomists. In the aftermath of the Mexican Revolution, the government had redistributed land to ejidatarios in some parts of the country which had broken the back of the hacienda system. During the presidency of Lázaro Cárdenas (1934–1940), land reform in Mexico reached its apex in the center and south of Mexico. Agricultural productivity had fallen significantly by the 1940s.[citation needed]