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In page Sweet tea:

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The oldest known recipe for sweet iced tea was published in 1879 in a community cookbook called Housekeeping in Old Virginia by Marion Cabell Tyree, who was born in Virginia.[1] The recipe called for green tea, since most sweet tea consumed during this period was green tea.[1][2] However, during World War II, the major sources of green tea were cut off from the United States (due to the Japanese invasion and occupation of green tea producing regions), leaving them with tea almost exclusively from British India which produced black tea. Americans came out of the war drinking predominantly black tea.[3] Sweet tea was once consumed as a punch mixed with hard liquor with flavorings of mint and cream,[2] with mint julep being a close version of the punch drink with its similar ingredients.[4]