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46) This movement, driven by powerful and diverse motivations, built a nation out of a wilderness and, by its nature, shaped the character and destiny of an uncharted continent.
47) The United States is the product of two principle forces—the immigration of European people with their varied ideas, customs, and national characteristics and the impact of a new country which modified these traits.
48) But the force of geographic conditions peculiar to America, the interplay of the carried national groups upon one another, and the sheer difficulty of maintaining old-word ways in a raw, new continent caused significant changes.
49) The first shiploads of immigrants bound for the territory which is now the United Sates crossed the Atlantic more than a hundred years after the fifteenth- and sixteenth- century explorations of North America.
50) The virgin forest with its richness and variety of trees was a real treasure-house which extended form Maine all the way down to Georgia.
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