Kansas-Nebraska Act is a decisions for 
USA. It is part of the chain of events and decisions that lead up the American Civil War. The real life act created the territories Kansas and Nebraska, but in the game, it will not have an affect on any states status as state or colony. In fact it does not have any special effect on Kansas nor Nebraska.
The Requirement is at USA has an average consciousness of 3.0. It raises consciousness in all free states by 1 and lowers consciousness in all slave states by 2.