How did the events surrounding the Battle of Dien Bien Phu contribute to US involvement in Vietnam?

It was at the battle of Dien Bien Phu that the colonial power France lost what was to be the last battle of their war against the Viet Minh. After this battle, the colonial powers conspired to divide Vietnam into two parts, North and South. This division, called the Geneva Accords of 1954, eventually led the communists in the north to try to re-unite the two parts of the country into one country. The attempts by the USA to prevent this led to the Vietnam War