People have been cultivating pumpkins for thousands of years, but their involvement in America’s fall festivities has a much more limited history. Like all good rags-to-riches stories, the humble pumpkin’s begins in 19th-century Ireland – sort of – and features a host of characters, from bonfire-lighting druids to multinational coffee conglomerates. As fall approaches, several brands have already started gearing up for a pumpkin-spiced season. It may come as a surprise to learn that Starbucks’ famous Pumpkin Spice Latte – an important checkpoint in pumpkins’ rise to their current lofty heights…