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New Territorial Troubles

In the mid 1800's many thought the need of a transcontinental railroad to promote growth in the territories along the route. Many Southerns favored the southern route, from New Orleans to San Diego part of that route would lead through northern Mexico.

Changes in Political Parties

Pro- slavery Southern Whigs and antislavery Northern Whigs Had long battled for control of their party, but now the party began to fall apart.