President Lincoln and the loyal people throughout the country saw the folly of separating.
President Lincoln once even referred to the example of Europe as something to be avoided.
What these "self determination" fanatics fail to see is exactly what you point out. We are stronger together than we could ever be apart. This is so obvious it makes me think that what the neo-rebs -really- want, is what really was lost in the ACW -- white supremacy. President had a part in ending white supremacy. That is what galls them about Lincoln, and that is why he is a tyrant to them.
It would be nice to have the freedom of a 19th century "mountain man" like Jeremiah Johnson, but it is just not doable.
Walt
As Benjamin Franklin once said, "We either hang together or hang separately." I strongly believe that had we allowed this country to split apart in 1860, we would have continued to fragment to the point where we would become a bunch of squabbling nations, constantly warring among each other, much like Europe over the past few centuries. Our strength is dependent upon our unity. There is no way we could have become the premier superpower on Earth and the greatest beacon of hope for freedom in the history of civilization, had we allowed the South to tear away from us.