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white prejudice. III. The progress of Westward Movement ? The westward movement began in the early 160039。s with European settlements along the Atlantic Coast of North America. It continued until the late 180039。s. First, some illegal immigrants went into west, and then American government brings these areas into their control. Then, many pioneers located in these areas. At first, pioneers were located in the east of Mississippi River. In the early 19th century, America expended its territory by the way of buying and invasion. In 1803, American government bought the Louisiana from French. From the early age of 19th century, the immigrants move to the west of Mississippi River. By the mid184039。s, adventurous pioneers had reached what are now California and Oregon in the Far West. The last frontier was the Great Plains between the Missouri River and the Rocky Mountains. The settlement of that region began in the 1