In 1865, the 13th Amendment to the United States Constitution was ratified, outlawing slavery. As far as Americans are generally concerned, that's been the end of it. We don't do that here, at least not anymore.
We do, however, have fast food here, and supermarkets. Have you ever gone to a fast-food restaurant and ordered something with tomatoes? Have you gone to the store and bought tomatoes?
Well, congratulations, sir or madam. You have supported slavery in Florida.
William Bornhoft of the UW-Milwaukee Post has the details. Or, as told by Devin Nunez of the Gainesville Sun, if you're in Florida, perhaps you'll stumble across a traveling museum attempting to raise awareness, run by the Coalition of Immokalee Workers.