"two indigo plantations on the Mississippi"
Mississippi River near New Orleans
Creative Commons Attribution Share AlikeMississippi River near New Orleans - Credit: duncan_idaho_2007

Indigo and Rice Paper Plants
Creative Commons Attribution Share AlikeIndigo and Rice Paper Plants - Credit: Ian McKellar
Indigo, cultivated for its rich blue dye, was grown on vast plantations and harvested by slaves. It was a source of great wealth for plantation owners, but is often thought to have caused serious health problems for the slaves who worked with it.

Further information on Indigo Plantations

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