translation.en: In North America, the lines that matter most on the map are not the US-Canada border or the US-Mexico border, but the dense network of roads and railways and pipelines and electricity grids and even water canals that are forming an integrated North American union.
translation.zh: 在北美，地图上意义最重大的一条线 并不是美加边境或者美墨边境， 而是公路、铁路、管道的交织网络， 还有电力网络，甚至是运河系统， 一个和谐的北美联盟因这些而形成。