How was the western expansion relate to the civil war?

The Westward Expansion was created because people moved to one spot to be able to create a state. The Civil War was created by the industrial north and the less populated agrarian south fought over state's rights issues, tariffs, and lopsided northern representation in Congress. Slavery was a very minor issue at the time. So what led to the Westward Movement of the Civil War? Unemployment and a largely destroyed South (homes, cities, bridges, downtown buildings, railroads, farms, and families) Primarily Southerners headed west, to begin new lives, in a new land.