what were the two sites of the most brutal uprisings in the Kansan conflict over slavery and what occurred at those locations?

The two sites of Kansan Conflict were - Sacking of Lawrence and the Caning of Charles Sumner.

Explanation:

The series of brutal anti-slavery movements, mostly known as Bloody Kansas or Kansan Conflict took place around 1854-1861 in the American state Kansas.

Against the Missourian pro-slavery army under Governor Wilson Shannon outside Lawrence, Charles L. Robinson and James H.

Lane raised their own army. In 1856, 21st November the Missourians attacked Lawrence and brutally destroyed many places, which is known as "Sacking of Lawrence."

On 22nd May, 1856 the abolitionist of Massachusetts, Charles Sumner was attacked by Preston Books with walking cane in protest of his anti-slavery speech, this is known as "Caning of Charles Sumner".