Why did some whigs and democrats for a new political party

Whigs and Democrats for a new political party:

The Democrats and Whigs were uniformly adjusted during the 1830s and 1840s. The Whigs additionally supported a government while Democrats favored state government. Whigs represented defensive duties, national banking, and government help for inside upgrades. Bondage is the thing that at last split up the Whig party in light of the fact that most northern Whigs put stock in annulling subjugation, while most southern Whigs thought the inverse. The Democrats were bound to grasp settlers' and states rights. In the mid 1850s, the two-party framework started to deteriorate because of enormous remote migration. By 1856 the Whig party had fell and been supplanted by another sectional gathering, the Republicans. However, by the 1850s, the Whigs broke down.

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Where is the map? it's not showing