In 1950 Pittsburgh's steel industry had collapsed; by 2010 the steel industry was dominant again.
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.
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 that 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 demographic changes that occurred during that period, as Pittsburgh experienced significant population decline from the mid-20th century due to the downturn of its steel industry and other economic factors.
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