Westward Expansion and Regional Differences Nation, slavery grow in new frontier Overall, the growth of the nation was enormous: Population grew from 7.25 million to more than 23 million from 1812 to 1852, and the land available for settlement increased by almost the size of Western Europe – from 4.4 million to 7.8 million square kilometers. Still unresolved, however, were the basic conflicts rooted in sectional differences that, by the decade of the 1860s, would explode into civil war. Inevitably, too, this westward expansion brought settlers into conflict with the original inhabitants of the land: the Native Americans. In the first part of the 19th century, the most prominent figure associated with these conflicts was Andrew Jackson, the first "Westerner" to occupy the White House. In the midst of the War of 1812, Jackson, then in charge of the Tennessee militia, was sent into
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