Before the American Revolution, rum was very widely produced, traded, and consumed in the American colonies. Rum manufacturing was one of the most profitable industries in New England, and estimates of its comsumption say that people in the colonies drank an average of 14 liters of rum each year. Even after the Revolution, George Washington ordered a big barrel of Barbados rum to be served at his inauguration.
But soon enough, rum declined in the U.S., and whiskey replaced it as the more commonly produced and consumed liquor (note that this is looking at hard liquor, not drinks like beer or wine). Trade with rum-producing British colonies in the Caribbean was restricted, and over time, whiskey simply became cheaper to make.
So, with a POD set after the end of the American Revolutionary War in 1783, prevent this decline somehow. Make it so that rum is not overtaken by whiskey in terms of how widely manufactured and consumed it is, and have it remain America's main liquor of choice.
But soon enough, rum declined in the U.S., and whiskey replaced it as the more commonly produced and consumed liquor (note that this is looking at hard liquor, not drinks like beer or wine). Trade with rum-producing British colonies in the Caribbean was restricted, and over time, whiskey simply became cheaper to make.
So, with a POD set after the end of the American Revolutionary War in 1783, prevent this decline somehow. Make it so that rum is not overtaken by whiskey in terms of how widely manufactured and consumed it is, and have it remain America's main liquor of choice.