| 1. | 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 , and finally the rocky mountains . at all times there were new frontiers to explore , new lands to conquer , and new dreams to pursue
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。 |
