CEVAP:

Second World War fought in 20th century taught the powers of Europe and world in general that settlement of interstate problems through war causes tremendous economic costs, catastrophic humanitarian consequences and complete destruction of the all parties included in the war. With the experience gained from these systemic wars, the new world order was established to
promote more diplomacy and put more decisive restrictions on use of force in world politics. Especially the horror of the Second World War has been quite influential in the construction of this new world order. As a result,  diplomacy has gained a greater significance in the post-Second World War world order.