<span>International Business Machines abbreviated </span>IBM<span> and nicknamed "Big Blue", is a multinational computer technology and IT consulting corporation headquartered in Armork, New York</span><span>, United States. The company is one of the few information technology companies with a continuous history dating back to the 19th century. IBM manufactures and sells computer hardware and software (with a focus on the latter), and offers infrastructure services, hosting services, and consulting services in areas ranging from mainframe computers</span><span> to nanotechnologu. Ginni Rometty</span> <span> is the president and CEO of IBM.</span>
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"Even today, the need for work is a common reason people move to urban areas."
This sentence, although not inaccurate, is not necessary in order for the rest of the paragraph to be coherent. The sentence states that nowadays, people continue to move for work. However, the passage is not a comparison between the past and the present. It simply wants to inform us of the changes that led to bigger cities. Therefore, you can remove this sentence without seriously altering the author's explanation.
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Theobald Theodore Friedrich Alfred Von Bethmann-Hollweg