from the sap of which tree is chewing gum made?

Answer 1

Though chewing gum bases are primarily synthetic today, gum was originally derived from natural sources such as tree resins and saps. The use of chewing gum made from tree resin dates back to ancient Greek and Mayan civilizations. In North America, Wampanoag Indians introduced chewing gum to European settlers. The gum was made from the resin of spruce trees.
American settlers traveling west learned about chewing chicle, the hardened sap of sapodilla trees, from the Osage Indians. The sapodilla tree is found mainly in the tropical rain forests of the Yucatan Peninsula of Mexico and Guatemala. By 1869 the first commercial chicle was manufactured, and in 1906 paraffin was added to chicle.