Why did stephen douglas want the kansas-nebraska territory organized?
he wanted to protect northerners from attacks by settlers.
he wanted a transcontinental railroad with a route through the territory.
he wanted it organized as a first step to statehood.
he wanted to prevent mexico from annexing the territory.

Stephen Douglas wanted the Kansas-Nebraska Territory organized because he wanted a transcontinental railroad with a route through the territory. This movement would very much benefit Douglas' Illinois constituents as well as for him to maintain civic-control towards such territory. Southern senators objected such proposal, hence the area was deemed as a free-state. 

1. the spread of reform movements aimed at perfecting american society