That is why we, the children of frontiersmen, city builders and immigrants, surprise Europe constantly with our worship of constitutions, our social and political timidity. 沃尔特·李普曼.政治序论.
Little was known of the topography of the country beyond the settlements of these frontiersmen. 尤利西斯·格兰特.U.S.格兰特的个人回忆录.