Right on the border between Derby Line, Vermont and Stanstead, Quebec, sits a historical landmark known as the Haskell Free Library. Home to a library and opera house, neighbors on both sides of the border said for more than a century, it has stood as a symbol of unity for their two countries. While Chris Blais has lived in Derby Line for 50 years, she never knew Pauline Lussier, who lived minutes away across the border in Stanstead for 25 years. But that changed Friday when the two women entered the library. They said from that moment, the strangers from different countries only saw each other as neighbors, united in their love for the library. “We never thought about it,” the women said, standing alongside each other in the library. “We are neighbors.”Even though the women said it doesn’t matter where they come from, U.S. Border Patrol said otherwise. The …