西汉前期,在汉朝境内东北和东南沿海地区有三个割据的地方政权南越、闽越和卫氏朝鲜。这三个小国对汉朝阳奉阴违,表面上听从汉朝的领导,背地里却在各自的国内自行其是,甚至与汉朝的北方强敌匈奴遥相呼应,不断从陆路和海路袭扰汉朝本土,给汉朝国内稳定和统一造成了极大的威胁。到了汉武帝刘彻 In the early Western Han Dynasty, there were three separatist local governments in the northeast and southeast coastal regions of South Korea: the South Vietnam, the Fujian and Vietnam and the Wechsler. The three small states obeyed the Han dynasty and ostensibly obeyed the leadership of the Han dynasty. However, the three small countries echoed their own enemies in their respective countries, even echoing the northern enemy strong enemy in the Han dynasty. They continued to harass the Han dynasty from land and sea, Domestic stability and unification pose a great threat. To the Han Wudi Liu Che