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12,860,702 DATE: 1830
17,063,353 DATE: 1840
23,191,876 DATE: 1850
31,443,321 DATE: 1860
38,558,371 DATE: 1870
From 1830 to 1870 the population increased dramatically along with its need for expansion.
As shown in document A, the population increased by millions every ten years. In document B, three maps are shown and from each map (the red dots are multiplying showing the increase in demand for railroads and the higher demand for more land).
Due to the increase in population (as shown in document C because it shows the people moving to the west), we needed more room so the expansion west was necessary.
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