Assertion: ranch's history | /r/HasProperty | a story of booms and busts
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Source sentences:
text: The history of the San Fernando Valley from its exploration by the 1769 Portola expedition to the annexation of much of it by the City of Los Angeles in 1915 is a story of booms and busts, as cattle ranching, sheep ranching, large-scale wheat farming, and fruit orchards flourished and faded.