I recall that Ireland won independence from Britain, formed the Irish Free State, later the Republic of Ireland (Eire) and that Eamonn de Valera (IRA) was the President back when.
de Valera was, like Confederates, a splitter. He left and took his ball when things did not go his way. He was the cause of the Irish Civil War (which is what it is called - even though there were arguably THREE governments involved). He was elected later.
Ireland is still NOT whole. The provisional government is an example of what the South tried to do. It did not succeed in its goal. There are also numerous other examples from WWII & the Cold war if you prefer.