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In page Maasai people:

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Due to an increasing population, loss of cattle due to disease, and lack of available rangelands because of new park boundaries and competition from other tribes, the Maasai were forced to develop new ways of sustaining themselves. Many Maasai began to cultivate maize and other crops to get by, a practice that was culturally viewed negatively.[1] Cultivation was first introduced to the Maasai by displaced WaArusha and WaMeru women who married Maasai men.[citation needed]