How do the territorial boundaries correspond with modern state borders?

The answer is

Between 1790 to 1850 the U.S. was extended territorially. This transformed the borders of the world, where United States territorial boundaries were equal to the borders of modern states. The government of the United States believed that the expansion of the world westward, the more expansion the more prosperous the region.

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explanation:

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d)to gain support for the independence movement.

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