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In page Spanish missions in California:

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The Rev. Pedro Estévan Tápis proposed establishing a mission on one of the Channel Islands in the Pacific Ocean off San Pedro Harbor in 1784, with either Santa Catalina or Santa Cruz (known as Limú to the Tongva residents) being the most likely locations, the reasoning being that an offshore mission might have attracted potential people to convert who were not living on the mainland, and could have been an effective measure to restrict smuggling operations.[2] Governor José Joaquín de Arrillaga approved the plan the following year; however, an outbreak of sarampión (measles) killing some 200 Tongva people coupled with a scarcity of land for agriculture and potable water left the success of such a venture in doubt, so no effort to found an island mission was ever made.[citation needed]