Well, I don't know your lesson, but hitler and stalin are some examples.
William McKinley set up his campaign headquarters in Chicago Illinois when he ran against William Jennings Bryan
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: more than 10,000 were killed or injured.
Explanation: American Civil War.
Explanation:
She served as the first lady of the United States from 1933 to 1945, during her husband President Franklin D. Roosevelt's four terms in office, making her the longest-serving first lady of the United States