Its apparent path of introduction was through the Middle East to North Africa, then to Sicily and Andalucia and via Spanish explorers to the West Indies, including the Florida Keys.
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The origin of Key lime pie has been traced back to the late 19th century in the Key West, Florida area.
On 1 July 2006, both the Florida House of Representatives and the Florida Senate passed legislation {HB 453} and {SB 676} selecting "Key lime pie" as the official pie of the state of Florida.