For more than 100 years, people in Stanstead, Quebec have been able to walk into Derby Line, Vermont to enter the border-straddling Haskell Free Library and Opera House – no passport required. Inside the library celebrated as a symbol of international friendship, Pauline Lussier and Chris Blais put their arms around each other’s shoulders Friday as they stood on either side of the line taped down the floor marking the border. “A line doesn’t separate us, it never has,” said Blais, who held an American flag in her hands while Lussier held a Canadian one.