The amount of maple syrup produced in in the United States has been declining, in part because of the shortening of the maple syrup season in the northeastern states. Meanwhile, Canadian production has been increasing because of increased marketing, government subsidies, improved technologies, and, likely, climate change.
SOURCE: FarreLL, M. L., and Chabot, B. F. (2012) Assessing the growth potential and economic impact of the U.S. maple syrup industry. Journal of Agriculture, Food Systems, and Community Development 2(2):11–17.