Protestors saw the attacks as an escalation of the war.
Im pretty sure this is the answer
The reason why antiwar protests increased after those actions was that the protesters saw it as an escalation to an already unjust war.
When the U.S. armed forces began to bomb and attack Viet Cong bases on the H-o Chin Minh trail, it meant that they were now attacking the Viet Cong outside Vietnam which is where the bases were located.
Anti-war protesters therefore ramped up their efforts because the war had now escalated to neighboring countries.
Find out more on the H-o Chin Minh trail at https://brainly.com/question/2458385.
