What issue led to the split in the democratic-republican party in the late 1850s

The issue about slavery led to the split in the Democratic-Republican Party in the late 1850s. The issue that led to the split in the Democratic-Republican Party in the late 1850s is the issue of slavery.

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

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yes i think there would be volunteers