问一篇藏文章中若干句子的理解。。。

freesaUID: 2225142

The historian Frederick J. Turner wrote in the 1890's that the discontent of farmland that had been developing steadily in the United States since about 1870 had been caused by the closing 6f the internal frontier -- that is, the exhaustion of available new land needed for further expansion of the American farming system. Not only was Turner's thesis influential at the time, it was later adopted and elaborated by other scholars, such as John D. Hicks in The Populist Revolt (1931). Actually, however, new lands were taken up for farming in the United States throughout and beyond the nineteenth century. In the 1890's when discontent of farmland had become most acute, 1,100, 000 new farms were settled, which was 500, 000 more than had been settled during the previous decade. After 1890, under the terms of the Homestead Act and its successors, more new land was taken up for farming than had been taken up for this purpose这里的thispurpose指的是什么？我觉得作者似乎一直在说agrarian discontent,没有说土地占用扩张还有其他的目的啊？) in the United States up until that time. It is true that a high proportion of the newly farmed land was suitable only for grazing and dry farming, but agricultural practices had become sufficiently advanced to make it possible to increase the profitability of farming by utilizing even these relatively barren lands.

The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance of changes in the conditions and consequences of international trade that occurred during the second half of the nineteenth century. In 1869 the Suez Canal was opened and the first transcontinental railroad in the United States was completed. An extensive network of telegraph and telephone communications was spun: Europe was connected by submarine cable with the United States in 1866 and with South America in 1874. By about 1870 improvements in agricultural technology made possible the full exploitation of areas that were most suitable for extensive farming on a mechanized basis. Huge areas of land were being settled and farmed in Argentina, Australia, Canada, and in the American West, and these areas were joined with one another and with the countries of Europe into an interdependent .market system. As a consequence, depressions of farmland no longer were local or national in scope, and they struck several nations whose internal frontiers had not vanished or were not about to vanish. Between the early 1870's and the 1890's, the mounting(这个mounting怎么翻译？ ) discontent of farmland in America paralleled the almost uninterrupted decline in the prices of American agricultural products on foreign markets. Those staple-growing(staple-growing怎么翻译？) farmers in the United States who exhibited the greatest discontent were those who had become most dependent on foreign markets for the sale of their products. Insofar as Americans had been hindered from taking up new land for farming, it was because market conditions had made this period a dangerous time in which to do so.

songjunUID: 2148769

up

simeonehuUID: 2134275

1 more new land was taken up for farming than had been taken up for this purpose  in the United States up until that time. 哥们，你这句话不能前后分开来看啊。。。他意思是“this purpose in the usa up until that time”,也就是,在此之前用于这一目的的量(in USA)，也就是说这个purpose还是farming,只不过是那个XX act颁布之后farming与up unti那个时候之前的farming比，我做这片文章时这句话也是一下没看懂，被你这样插入语一弄更是一下闹不明白了。。哎，还好看了几遍想起来。l
2 mounting,增长，崛起，突显之意
3 staple－growing 主要农作物种植，大概就是粮食种植的意思吧

freesaUID: 2225142

en,3x啊，其实我开始也想到this purpose是指前面的farming，但是后来又不是很肯定，就像上来问一下，看看大家是怎么看的。。。后面两个词的解释很是很赞的。。。