Maricopa County started a free library system the day after the stock market crash in 1929. The enormous population increases in the 1960s and 1970s led the County Library System to undergo reorganization to meet the demands of the residents. In 1986 the State Legislature passed a bill allowing Arizona counties to establish library districts. In 1987 the County Board of Supervisors voted to form the Maricopa County Library District (separate governmental and tax entities). The County Board of Supervisors serves as the District's Board of Library Directors.