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.
The National Liberation Front of South Vietnam, which was a mass political organisation that fought against the United States and its allies. Hope this helps!
Thor was the Norse god of thunder, I don't think he was the god of luck too.
Here's link to the answer:
tinyurl.com/wtjfavyw
