How was the West drawn closer to the North and the South further isolated?

Why did an increase in productivity lead to an improvement in transportation technology ?

3 answers

When? What country?
Have you any ideas? Think about the states that were admitted to the union in the years prior to the Civil War: Michigan, Kansas, California, etc. (Yes, Michigan was considered "west" back then. Were they slave states or free states?
Question two is kind of a chicken-and-egg problem: which comes first? The development of railroads (technology) increased productivity, but increased productivity led to a demand for railroads. If you don't understand "productivity," look it up. I can think of several examples of new technology prior to the Civil War that led directly to greater productivity and I'm sure you can, too.
Oh, yes, Ms. Sue. I am assuming the U.S. in the years leading up to the War Between the States.