The compromise of 1850 was passed, making California a free state but also, declaring the fugitive slave act, which forced free states to return runaway slaves to their owners.
Fugitive slave act/Underground Railroad
As a response to the fugitive slave act, a group of abolitionists formed the Underground Railroad, a network of "conductors" who would hide fugitive slaves and help them reach freedom in Canada
The Sack of Lawrence
Thank you for letting me into your house
Popular Sovereignty was the right of residents of a given territory to vote on slavery
Pottawatomie Creek Massacre
Yes or No to slavery?
Settlers from both the north and south came to Kansas to make it either a slave state or a free state, depending on the majority
Anti-slavery settlers founded the town of Lawrence, a pro slavery jury though that they were traitors and sent a posse of 800 men to arrest them, they swept through Lawrence arresting the settlers and destroying their HQ.
A group Led by John Brown, an abolitionists who believed that other abolitionists were killed at the Sack of Lawrence, went to Pottawatomie creek to seek revenge on people who were pro-slavery.