The makers of Corona and Heineken as well as equity firms have also been acquiring and investing in craft beer, the only part of the United States beer market that's still growing. Craft beer has captured more than 10 percent of beer sales in recent years and, according to the Brewers Association trade group, the country now has over 4,100 breweries, the highest number since 1873. More than two breweries open every day across the country.