Would D-Day ever have happened ???
Just so happens in Winchester, D-Day is also Confederates' Memorial Day.
After war between the states, people used to say the United States "are." After, the United States "is."
Historians theorize, had Lincoln wearied after a possible truce might have been conducted in Canada, that the North and the West would have split into 3 countries or confederations, and that by WWI, perhaps all 4 countries would have loosely allied in various degrees of intensity to help.
In any case, it is very possible we might have avoided the hubris that runs our foreign policy ever since the end of WW11 .
In fact this case is one of many ironic twists of history whereby the cause of eradicating slavery created a super nation whose ego began to forget the lessons of the forefathers who warned of foreign entanglements.
Who is also to say what other problems would have arisen had the United States split into five different confederations, New England, MidAtlantic, Midwest, West Coast and the South ?
Or to the present conflict in Iraq. Would Saddam living 10 more years confronted the world with something worse than the hell we created now ? Who knows ? I would guess that an UN-disunited States may not have gotten entangled on that and many other excursions from the Cold War on. Our ego would not have magnified the enemy to whip up the mood.