On January 17, 1920, less than one hour after spirits had become illegal throughout the United States, armed men robbed a Chicago freight train and made off with thousands of dollars worth of whiskey. It was a first taste of the unintended consequences of Prohibition. So what exactly was Prohibition, and why did it happen?

1920年1月17日，在烈酒在全美成为非法后不到一小时，武装人员抢劫了一列芝加哥货运列车，并抢走了价值数千美元的威士忌。这是对禁酒令意外后果的初尝。那么禁酒令到底是什么，为什么会发生呢？