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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the positive effects of the Columbian Exchange were the many crops brought to the Old World from the New World. Some of these eventually became staples in cuisines around the world. These included potatoes, tomatoes, maize, sweet potatoes, cassava, and cacao, which is used to make chocolate.
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Answer:
Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier.
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Answer:
The Supreme Court ruled on March 8, 1857 that crossing state borders into a "free state" did not entitle slaves to their freedom.
Explanation:
Dred Scott was a slave during that time period who was brought into a "free state" by the family that owned him. Dred Scott argued that since his was brought into that state it should therefore grant him his freedom. Unfortunately, the Supreme Court thought otherwise. They ruled that slaves were "property" and that property can be taken anywhere.
