What's the Main Cause of the American Invasion in Vetnam?

I have always said that i believe in democracy. I believe that the people are the ultimate arbiters of their own fate. But then, if so, sovin have the right system. The it doesn't matter which system it is. There what could work better for india? Any system that gives u stability and these in these things, long term national interest. So you can have that width within a democratic system, for sure. That's what we need to do, and to ensure that there is security, stability and prosperity in the long run,. over a time span of decades and centurie, centuries!