What if the American Civil War had gone differently?

The Union fights four years to stop the slave states leaving, and ends slavery doing it.

If it had gone differently: The Union splits for good; there is no single continental United States to become the next century's dominant power.

1. 1870The first globalisation, The world economy stays a patchwork of regions; no belle-époque boom, and no 1914 shock when it unwinds.