In 1990, Engineers digging a railway tunnel under the Channel broke through the last dividing rock and joined Britain to mainland Europe for the first time since the Ice Age.
Democratic caucus-goers express their preference through a show of hands, a sign-in sheet or by dividing themselves into groups according to candidate.
Over the years thousands of ingenious East Germans made it through, around, over, and under the Wall and other fortifications dividing the two Germanys.