After a quarter century of intervention in Indochina, the United States have come to disengage. This results in the withdrawal of their military forces, their support and sacrifice of the Indochinese regimes they have hitherto maintained and supported. This also means a loss of influence in favor of the socialist and communists. In other words, the U.S. has accepted the change of political regime in Laos, Cambodia and South Vietnam. Also the "containment" they went to the disengagement, the immediate consequence of distant and it is predictable in Indochina because any withdrawal of the United States of this region causes the irretrievable loss pro-American regimes that are installed. Just as the U.S. withdrawal from Laos causes the fall of the pro-American regime in Vientiane.