The Netherlands, Belgium and Luxembourg are well on the way to economic unity. Ready to adopt a joint customs schedule for all foreign goods shipped into the Lowlands.

While people talked, more earnestly than ever before, about a possible European federation, the Lowlands countries did something about it. The Netherlands, Belgium and Luxembourg (an economic unit which would likely rank third after U.S. and Britain as the world’s biggest free-enterprise producer and customer) were well on the way…