What event heightened concerns in 1800 that the nation might not survive, but fracture?

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The Gabriel slave conspiracy heightened concerns in 1800 that the nation might not survive, but fracture. Gabriel, a slave in Virginia, organized a planned rebellion of slaves in the area in August 1800, causing great fear among the white population and prompting harsher slave laws. This event brought to light many of the concerns and tensions surrounding slavery in the United States and contributed to fears that the country might eventually break apart over the issue.

What Event Heightened Concerns in 1800 That the Nation Might