I think it was because the first people to get there could choose whether or not the state allowed slaves. Therefore both sides wanted to quickly get there and claim it as their own.
Kansas
The Kansas - Nebraska Act was passed by both Houses in the Congress. This resulted in violence between pro slavery people and anti slavery abolitionists. Thus the term "Bleeding Kansas was used to describe the fighting there.
There was bullet shooting, cannons about 50 people died during the years 1854-1859.
They were disappointed that the experiment with putting slavery to the vote seemed to be causing violence, and they blamed the South for sending ruffians into Kansas to intimidate the voters. The South, of course, blamed the North for doing the same.
Putting the slavery issue to a local vote. It was a magnet for terrorists from both sides to try to intimidate the voters.
Tensions and violence over slavery spread outside Kansas
Violence broke out in Kansas in 1851 due to the ongoing conflict between pro-slavery and anti-slavery settlers vying for control of the region. The struggle to determine the state's stance on slavery escalated tensions and led to acts of violence and aggression between the two groups.
Bleeding Kansas
Tensions and violence over slavery spread outside Kansas
Tensions and violence over slavery spread outside Kansas
Lincoln wanted Kansas to fight the south; instead, Kansas seceded from the union and fought with the south
Tensions and violence over slavery spread outside Kansas
Violence
no
No- and not just Kansas, but nowhere in the US. FEDERAL law.
Violence erupted in Kansas due to the passage of the Kansas-Nebraska Act of 1854. Pro-slavery people and anti-slavery people became savage with each other over the issue of slavery. The result of the severe violence is termed "Bleeding Kansas".
Tensions and violence over slavery spread outside Kansas