求美国西进运动影响的英文资料 ~~~

这是我上课要用的资料,我整理的,希望能帮到你Westward Movement (1820 ~ 1849)
The early 19th century, thousands of people went across the Appalachian Mountains or moved to west, and some pioneers, moved to the United States border, and even to the places which belonged to Mexico's territory in depth, and between Alaska and California, Oregon. The pioneers are brave and diligent, and they went to the west to seek a better life.
The Westward Movement is a large-scale immigration, which developed the processes of the American west and the urbanization, industrialization and the national integration of United States.
The Westward Movement of the U.S have had a significant and far-reaching impact on economic, political and social.
The development of agriculture in the western region provided for industrial development a large amount of food, raw materials, exports and domestic markets.
It made the labor force’s layout of United States changed; It promoted the formation o