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5. Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.
6. The so-called “old immigration” described the group European immigrants who “came mainly from Northern and Central Europe (Germany and England) in early 1800 particularly between 1820 and 1890 they were mostly protestant”and they came in groups of families they were highly skilled, older in age, and had moderate amount of money in addition, they were quick to assimilate with the American citizens their main reason for coming was to seek settlement and escape the poverty and food scarcity due to droughts .
7. As for the New immigrants, they were younger mostly male dominant “they came from Eastern and Southern Europe from countries like Italy, Poland, Greece, Russia they came in search of Economic opportunities” but most of them never intended to become American citizen they were working in the US just earn enough to send money back to their familiar which gave them the name “ Birds of Passage”. The new wave of immigrants was either catholic, orthodox, or Jewish they came impoverished, unskilled, and illiterate also most of the immigrants from the new wave came separately as a form of smaller groups or individuals like a father and son or single men who were looking for jobs.
8. Push factors “push” people away from their home and include things like war. Pull factors “pull” people to a new home and include things like better opportunities. The reasons people migrate are usually economic, political, cultural, or environmental.
9. the same than 8
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