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.
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Explanation:
I think it is a. <span>Albert Einstein
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Much of early Harappan history remains a mystery because the archaeological remains are below the existing water table.
<h3>What is meant by Harappan history?</h3>
This is what was as also referred to as the Indus civilization. This was the civilization that was built around the Indus valley. The civilization can be dated back to have occurred between the periods of about 2500–1700 bce.
The Southern sites of the civilization is said to have lasted for a longer period than this time period.
Hence we can say that Much of early Harappan history remains a mystery because the archaeological remains are below the existing water table.
Read more on history here: brainly.com/question/25670011
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When analyzing a source, historian has to remain unbiased and free from personal feelings and opinions. They know that there are different source of an event and they may reveal different facts which could cross-check his argument. The objective historiography is possible only when the historian is unbiased and when different sources like archaeological, literary and other sources are cross-checked and interpreted independently.
