This week the British Prime Minister Theresa May initiated the formal legal process of exiting the United Kingdom from the European Union. While some parts of the UK, like Scotland and Northern Ireland, might like a do-over of last year's referendum, British citizens living in other parts of Europe also are worried how Brexit will change their daily lives. One of those places is Gibraltar, a three-square-mile territory attached to Spain that has been under British rule since 1704. NewsHour Weekend Special Correspondent Amy Guttman went there to report on an uncertain future.