美国社会与文化,论文.doc

美国社会与文化,论文
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate sizerement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
早在北美殖民地时期，向西移民的活动就开始了。南部的奴隶主、北部的土地投机商和贫苦的老百姓，都希望在西部获得土地。英国政府为了把殖民地人民限制在能够控制的地方，于1763年颁布了禁止移民越过阿巴拉契亚山脉以西的公告令。独立革命粉碎了这一规定。美国独立之后，美国的西进运动才变得更加积极和有计划，而且一直持续到现在。
纵观美国将近一个世纪的西部开发过程，成功是显著的，不仅是对于西部，同时对于整个美国来说都是成功的。之所以西进运动能够得到成功，有多方面的原因。
美国颁布了一系列的政策。
一是在土地政策方面，联邦政府颁布了在西部建州的程序和规定，对西部开发和经济稳定发展起了积极的促进作用，还颁布了居民获得土地的政策，为农民取得土地和进行农业开发提供了制度和政策保障，促进了美国西部的开发，使美国能够快速发展成为一个农业大国；二是在移民政策方面，联邦政府依法规定人们可以向西部自由迁徙，使得群众性的大规模
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