A beignet is a square of fried dough sprinkled – or in some cases dredged – in powdered sugar. These are a specialty in New Orleans and very good they are too.
But they are also a feature of French Canadian cooking and are eaten in Maine. Because of the Arcadians (who were expelled and went to Louisiana. Arcadians = Cajuns. Does anyone remember the poem Evangeline by Longfellow?) French cooking went as well. There it combined with some Spanish but mostly African cuisine to make Cajun food.
But surely beignets were not eaten with powdered sugar in the 1790s? Well, you can make powdered sugar from regular sugar with a mortar and pestle so yes, probably they were. However, beignets are delicious with regular sugar too. And sugar has been around for millenia. It was discovered/invented in India and went from there to the Middle East. In the Middle Ages it was considered a fine spice and was wildly expensive. The transformation of sugar cane (growing, harvesting and cooking down to the granulated state) is very labor intensive. But, by the early 1700s, plantations – worked by slaves – were already being set up in the West Indies.
From there, sugar cultivation went to North America, primarily southern Louisiana. The slave trade from Africa, already begun in the West Indies, went to the South of the colonies. One of the tour guides said that sugar cultivation – so labor intensive and so lucrative, was primarily responsible for the explosion of slavery. (I would guess cotton comes in second.)
From 1710 to 1770, sixty years, the per capita consumption of sugar went up five fold. Today we eat many tons.