They argued that white was the superior race. And that immigrants would destroy the country (: hope I helped!
Answer:
"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.
Defence of member nations
War Reparations is the best i can think of from WW2