托福阅读TP20原文：移居西部.docx

智课网TOEFL备考资料 托福阅读TPO20原文：移居西部 摘要： 托福阅读TPO20原文共包含有3篇文章，但是这3篇文章内容较多，我们就不为大家一一介绍了，下面是托福阅读TPO20里面中的一篇，大家可以点击页面总的免费下载按钮，下载完整版TPO阅读内容即可。  托福 阅读TPO20原文：移居西部Westward Migration  The story of the westward movement of population in the United States is, in the main, the story of the expansion of American agriculture—of the development of new areas for the raising of livestock and the cultivation of wheat, corn, tobacco, and cotton. After 1815 improved transportation enabled more and more western farmers to escape a self-sufficient way of life and enter a national market economy. During periods when commodity prices were high, the rate of westward migration increased spectacularly. Old America seemed to be breaking up and moving westward, observed an English visitor in 1817,during the first great wave of migration. Emigration to the West reached a peak in the 1830s. Whereas in 1810 only a seventh of the American people lived west of the Appalachian Mountains, by 1840 more than a third lived there.  Why were these hundreds of thousands of settlers—most of them farmers, some of them artisans—drawn away from the cleared fields and established cities and villages of the East? Certain characteristics of American society help to explain this remarkable migration. The European ancestors of some Americans had for centuries lived rooted to the same village or piece of land until some religious, political, or economic crisis uprooted them and drove them across the Atlantic. Many of those who experienced this sharp break thereafter lacked the ties that had bound them and their ancestors to a single place. Moreover, European society was relatively stratified; occupation and social status were inherited. In American society, however, the class structure was less rigid; some people changed occupations easily and believed it was their duty to improve their social and economic position. As a result, many Americans were an inveterately restless, rootless, and ambiti