From the earliest English settlements at Jamestown(1607) to the end of the 19th century , Americans pushed constantly westward, first along the Atlantic coast area, then the Allegheny Mountains, the Mississippi River, the Missouri River, the Great Plains
From the earliest English settlements at Jamestown(1607) to the end of the 19th century , Americans pushed constantly westward, first along the Atlantic coast area, then the Allegheny Mountains, the Mississippi River, the Missouri River, the Great Plains
就这样，从最早的英国定居点詹姆斯镇（1607年）到19世纪末，西行的浪潮不断推进：从大西洋海岸到阿勒格尼山脉、密西西比河、密苏里河、大平原直到落基山脉——在这推进的过程中，总有新的边疆去开拓，新的土地去征服，新的梦想去实现。