Slavery was the staple of our economy at the time. The textiles up North, also being profitable, would have continued to develop and I suspect that slavery would have made it's way into industry. Ultra low wage workers in factories would have given the US a distinct competitive edge. Eventually there probably would have been a rebellion from the non-whites which have become strong and skilled and the US would be primarily black. The international banks would have had more trouble moving in being run by white people, which the black people of the US would not trust, and the Great Depression wouldn't have happened. This would have primed the US to enter the World Wars quicker with more armament and we would have won sooner. Under president Martin Luther King Jr., the US would have had peace talks with the Soviet Union and avoided everything from Korea to Vietnam to the Mujahadin (meaning no modern day Taliban or al Quaeda).
In other words, I have absolutely no idea and it seems that there's not enough information to guess.
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