Responses
Pittsburgh in 1950 had clean air; Pittsburgh in 2010 had air pollution that caused streetlights to be turned on during the day.
Pittsburgh in 1950 had clean air; Pittsburgh in 2010 had air pollution that caused streetlights to be turned on during the day.
In 1950 Pittsburgh’s steel industry had collapsed; by 2010 the steel industry was dominant again.
In 1950 Pittsburgh’s steel industry had collapsed; by 2010 the steel industry was dominant again.
By 1950 the population of Pittsburgh was about 675,000; the population of Pittsburgh was about 305,000 in 2010.
By 1950 the population of Pittsburgh was about 675,000; the population of Pittsburgh was about 305,000 in 2010.
By 1950 the population of Pittsburgh was about 305,000; the population of Pittsburgh was about 675,000 in 2010.
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The statement that correctly compares Pittsburgh in 1950 to Pittsburgh in 2010 is:
"By 1950 the population of Pittsburgh was about 675,000; the population of Pittsburgh was about 305,000 in 2010."
This accurately reflects the population decline that Pittsburgh experienced over the second half of the 20th century.
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