Because slave labor was vital to the southern economy and to other places around the world, it became apparent that the south, with a already strained relation with the north, would ally with outside countries to protect its economy. However, classifying the war as a war to free slaves is redundant as political tensions more closely characterized hateful views between the north and south. So with already strained tensions between the north and south, it was unlikely that slaves could have been freed diplomatically.
The three most important problems was that it gave to much power to the states (weak central government), it did not give the federal government the power to tax, and congress couldn't regulate trade.
