Why was the invasion of Cambodia seen as such a big deal during Vietnam?

Question:Was it just another Vietnam about to happen?

Best Answer - Chosen by Asker: Was it just another Vietnam about to happen?

Yes. People already hated the administration and saw this as an expansion of the war they were trying to stop. Americans went in, opened door for Viets and they got their tails kicked. Typical.

Yes, the war was going to expand and it also hit hard in the US with the Kent State incident.