Last night we told you how the brewing industry took shape in Minnesota's early years.Tonight, we present part two: how it all went flat.News 12's Ryan Gustafson reports.After nearly 80 years of advocacy and organization, the temperance movement finally reached its goal, when the Eighteenth Amendment to the Constitution of the United States went into effect on January 16th, 1920.Though the local brewers, as well as those on the state and national levels, were seeing the effects early.Doug Hoverson says, "Prohibition didn't just come all at once in 1919 and 1920. There were a number of different counties, especially throughout southern Minnesota, which started to go dry earlier on a county-by-county and sometimes town-by-town basis.Doug Hoverson is the author of Land of Amber Waters: The history of brewing in Minnesota.He says that while some breweries were able to keep up and running through Prohibition, it wasn't because of support for dry living.It was the non-alcoholic beer that was flowing through the taps.Hoverson says, "The near-beer products were not very popular. They ultimately were a way for the brew master to stay employed and keep his skills up."When The Great Depression hit, coupled with the ultimate failure to enforce the law or eliminate demand, the 21st Amendment to the Constitution repealed Prohibition.But it was a brave new world for the industry.Ted Marti says, "The whole market of the American beer market had changed."Hoverson says, "Brewery trucks had just started to be used before Prohibition. But 15 years later, the state is covered with a network of roads and every business has a delivery truck at this point. And that means that breweries can compete on each others territory much more easily than they could before."Ted Marti says, "Now you had competitors from Milwaukee and St. Louis and New York and so forth.""At 7th and Rock, this gate is all that remains of the Bierbauer Brewery, which later became Mankato Brewing Company. At its peak, it was producing 90 thousand barrels a year. But at the end, only 10% of their sales were coming from the Mankato area, and that was no way to compete with Milwaukee's Miller and St. Louis' Anheuser-Busch."Ted Marti says, "With the advent of advertising and sporting events and sponsorships and TV, that really gave the power of the reach to the big guys."With America developing a taste for lighter beers, in line with the hip national trends, coupled with the challenge of scarce resources during World War Two, the local brewer continued to decline.So much so, that by 1969, there would be only one left in Southern Minnesota.But just as quickly as America's taste for beer could swing to light and golden and national, there was a new trend brewing, and it was going to take American beer back to its roots.Ryan Gustafson News 12.You can catch the final part of this series Thursday night on news 12 at ten.