"Seldom in the history of any country has a single unlucky bullet so utterly altered the course of events. Indeed, it would be no exaggeration to say that Ireland suffers the consequences to this day. Had Michael lived, it is highly probable that he would have brought the civil war to a speedy conclusion and succeeded in healing the breach with the North, leading to the removal of partition which few politicians, from Lloyd George and Churchill downwards, regarded as anything other than a purely temporary measure in 1922. After Michael's death, however, the South had no one with the breadth of vision and the negotiating skills to tackle Sir James Craig, and as time passed, the breach between North and South widened. Michael would almost certainly have prevented the Ulster boundary crisis of 1925, with its tragic consequences for Anglo-Irish relations over the ensuing seven decades. This arose when the report of the Boundary Commission was published, revealing that not an inch of Northern Ireland was to be ceded to the Free State, despite the wishes of at least a third of the inhabitants of the Six Counties. This bombshell reopened old wounds and almost triggered off a renewal of civil war in southern Ireland."
Irish Civil War

January 1, 1970