[IronJack]

Just as inaccurate is to cite "states rights" as the cause.

Which is why I didn't.

A much larger issue is human greed as feed by cheap labor.

Perhaps in the Marxist world where everything is defined in terms of class struggle. But not as a particularly relevant factor in the American Civil War.

[Kay Soze]

I beleive it matters in capitalist economy in which a free market must decide the value of labor.