How will you correct the word in bold?
"American's first subway systems"
How can you rephrase this: "...did not only have ..."
How did the influx of immigrants affect cities?
A: The influx of immigrants led architects to develop new approaches to housing and transporting large numbers of people. This resulted in the development of skyscrapers, horsecars, cable cars, and electric trolley cars. Because congestion was so bad in the largest cities, engineers were also led to look for ways to move mass transit off the streets. Chicago responded by building an elevated railroad, while Boston, followed by New York, built American's first subway systems. The influx of immigrants did not only have positive effects on cities, however. Sanitation conditions of major cities became inadequate because cities were simply unable to keep up with the influx of immigrants. These cities also became overpopulated.
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