The Star Tribune reports that the U.S. is becoming a "cold-brew nation" due to the increasing popularity of cold brew coffee. Cold brew was still a relatively limited market until 2015, when Starbucks introduced the drink in several select stores. Today, it is available at all of its 13,000 U.S. locations and other chains are taking notice, including Dunkin' Donuts. The article also states that Millennials are driving the trend, as well.