What did the Geneva agreements of 1954 decide about the future of Vietnam?

N & S Vietnam were created as one term in the treaty signed between the French and the Communist government in Vietnam. The country was supposed to hold democratic election and reunification itself by 1956; no other countries were allowed to interfere. This did not happen as the US came replacing the French in South Vietnam to stop the spread of communism in the South East Asia, violating the treaty. This led to the Vietnam War later