Pittsburgh in 1950 had clean air; Pittsburgh in 2010 had air pollution that caused streetlights to
be turned on during the day.
By 1950 the population of Pittsburgh was about 675,000; the population of Pittsburgh was about
305,000 in 2010.
In 1950 Pittsburgh’s steel industry had collapsed; by 2010 the steel industry was dominant again.
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 correct statement comparing 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 statement accurately reflects the significant population decline that occurred in Pittsburgh from 1950 to 2010.
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