The start of the vietnam war was catstrophic and it mainly happened because the other countries wanted to force Vietnam into communism. The problem was one side of Vietnam agreed and the otherside didn't. We got involved because if Vietnam were to go into communism, it would give communism more power, abilities, and advantages, giving them the feeling of pushing it onwards to other countries and if the other countries where to turn communist as well they would have enough power to take the U.S. down with them and thats how we got involved in the domino effect.
I really hope this helped some!
