John F. Kennedy was warned that the spread of communism had to be stopped
<span>These difficulties eventually resulted in the development of a transcontinental railroad. All the inventions and developments in the world are meant to make people's lives easier and comfortable, and this event is not an exception. In order to blur terrotorial boundaries the First Transcontinental Railroad was introduced to the US. It connected the eastern nad western parts of America.</span>
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Explanation:
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It has increased.
In 2006, the United States produced more steel than it did in 1900, but China was the world's leading steel producer in 2006.
