 Here's what happened on this day in Delmarva history. Well, we're still working on the Delmarva aspect of it, but on this day in history, some highlights. On this date in 1862, during the Civil War, Congress approved the Second Confiscation Act, which declared that all slaves taking refuge behind Union lines were to be set free. On this date in 1902, Willis Carrier produced a set of designs for what would become the world's first modern air conditioning system. And thank God for that, right?