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The evasion of the slavery issue by Whigs and Democrats in 1848
Led to the formation of the new Free Soil antislavery party
The Fugitive Slave Law
Aroused active northern resistance to legal enforcement and prompted attemps at nullification in Massachusetts
The Pierce administration's schemes to aquire Cuba
Fell apart after the leaking of the Ostend Manifesto
The Gadsden Purchase
Heightened competition between southern and northern railroad promoters over the choice of a transcontinental route
Stephen Douglas's indefference to slavery and desire for a nothern railroad route
Led to the passage of the Kansas-Nebraska Act, without regard for the consequences
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