Popcorn was grown by Native Americans long before the Europeans came to the New World. The Aztecs used it, strung into garlands, in their religious ceremonies. Peruvians toasted and ate their popcorn, which was called pisancalla. During the 1830's, it was "discovered" by American farmers who, using a new kind of plow, planted acres and acres of it during the 1850s. By the turn of the 19th century, popcorn vendors could be found in every big city. They'd sell their wares by the bag or the ball and make a profit of about 70 cents on every dollar!