Which American-owned brewery led the country in sales by volume in 2015?

D. G. Yuengling and Son, Inc., an American-owned brewery, led the country in sales by volume in 2015. The brewery's success can be attributed to several factors. First, D. G. Yuengling and Son, Inc. is one of the oldest breweries in the United States, having been established in 1829, which has given them a strong and loyal customer base. Additionally, the brewery has consistently focused on producing high-quality beers that appeal to a wide range of consumers. Their commitment to crafting traditional and flavorful brews has resonated with American beer drinkers, driving their sales and earning them the top spot in terms of volume in 2015.