Answer:
Slavery
Explanation:The United States became a continental nation with the purchase of Louisiana from France in 1803 and the settlement of the lands beyond the Appalachian Mountains. Westward expansion fueled conflict with Native populations and led to their forced removal. By 1820, 2 million Americans lived west of the Appalachians, out of a total national population of 10 million. The regional cultures that had developed along the Atlantic Coast—New England, Middle Atlantic, Chesapeake, and Carolinas—were transplanted into the Old Northwest (Ohio, Indiana, Illinois, Michigan, and Wisconsin) and the Old Southwest (Arkansas, Kentucky, Louisiana, Missouri, Tennessee, and Texas). But although Americans had begun to identify themselves as a nation, they were divided by sectional interests that deepened with rapid industrialization and the question of slavery.
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The innovation that had the greatest impact on westward migration was d. transcontinental railroad.
Answer:
sacro imperio romano germánico , después los visigodos fueron los que unificaron los remanentes post imperiales
Democratic dominance of the South originated in the struggle of white Southerners during and after Reconstruction (1865–1877) to reestablish white supremacy and disenfranchise blacks. The U.S. government under the Republican Party had defeated the Confederacy, abolished slavery, and enfranchised blacks.