<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> The role of the United States in the Vietnam War began after World War II and escalated into full commitment during the Vietnam War from 1955 to 1975 . The US involvement in South Vietnam stemmed from 20 long years worth of political and economic actions taken, which all had the common incentive to end the growing communist domination in Vietnam . President Harry S Truman provided progressively increasing amounts of financial and military assistance to French forces fighting in Vietnam . From the spring of 1950, their involvement increased from just assisting French troops to providing direct military assistance to the associated states (Vietnam, Laos, Cambodia). Eventually, US missions was carried out at a more constant rate by sending out increasing number of military assistance from the States . Their main intent was to not allow the Communist domination that was present in the government of Vietnam as there would soon be a chain of neighbouring countries that would follow . This would have resulted in a change in balance of power throughout Southeast Asia . Essentially, the US saw their major security interests being disturbed due to the rise of the communist expansion and strived to take any measure to end it . </P> <Ul> <Li> Wilson ignores petition by Ho Chi Minh for help in creating Vietnam independent from French rule and led by nationalist government . </Li> </Ul>

When did the us enter the vietnam war start