Henry Kissinger did his undergraduate thesis (as told by his roommate at a talk in the late 1970's) and made the following observations.
After the Congress of Vienna after the Napoleonic wars, things were put back in place and changes allowed to happen naturally. A hundred years of relative peace in Europe ensued.
After the Treaty of Versailles after World War I, the Allies exacted huge reparations from Wiemar Germany to pay for the war, which led to World War II. The Marshall Plan after the war, for Germany and Japan, was, in part, a return to the strategy of the Congress of Vienna.
One idea Henry Kissinger took from this was that, paraphrased is, "
A peace without victory is a victory for peace".
He used this idea in the Middle East. This strategy would appear to works with kids too.