Wisconsin is known as “America’s Dairyland,” but the milk makers who gave the state its moniker are vanishing, falling prey to a variety of impediments, including President Trump and his global trade war.Over the past two years, nearly 1,200 of the state’s dairy farms have stopped milking cows and so far this year, another 212 have disappeared, with many shifting production to beef or vegetables. The total number of herds in Wisconsin is now below 8,000 — about half as many as 15 years ago. In 2018, 49 Wisconsin farms filed for bankruptcy — the highest of any state in the country, according to the American Farm Bureau Federation.