“合纵连横”是战国中后期各诸侯国为争取盟国 ,孤立敌国 ,对夹在中间的国家或是分化或是拉拢的外交策略。其具体的情形在不同历史时期有着相应的变化 ,但通常情况下 ,所谓“合纵” ,指苏秦游说六国诸侯联合拒秦 ;所谓“连横” ,指张仪游说各诸侯事秦。那么 ,何以六国之间称“ The “vertical and horizontal” are the diplomatic tactics of the vassal states in the middle and late Warring States Period for seeking allies, isolating the enemy countries, and for the countries in the middle of the war or for diverging or drawing back. The specific circumstances have changed correspondingly in different historical periods. However, under normal circumstances, the so-called “co-ordination” refers to Su Qin's lobbying for the joint rejection of Qin by the princelings of the six countries. The so-called “Lian Heng” refers to Zhang Yi's lobbying of various princes and Qin. So, why the six countries called "