Well, we discovered that we needed to upgrade security so that potential criminals weren't coming into our country, and so potentially harmful substances weren't being brought onto our planes. That meant literally anything that could become a bomb, start a fire, stab someone etc. As for Pearl Harbour, I think that had more of an affect on how we thought our military and defence system was working.
Answer:
Check attachment
Explanation:
Read the footnote on the attached screenshot
<span>Many Americans opposed the war on moral grounds, opposed by the devastation and violence of the war. Others claimed the conflict was a war against Vietnamese independence, or an intervention in a foreign civil war; others opposed it because they felt it lacked clear objectives and appeared to be unwinnable.</span>
-Enough is Enough stop child labour
I mean I can think of more but I need more information
