Why Was the Development of Cast-Iron and Steel-Frame Construction Techniques

question 23

Multiple Choice

Why was the development of cast-iron and steel-frame construction techniques significant to the growth of cities?

• A) The growth of streetcars depended on such techniques.
• B) They were the primary engines of job growth.
• C) They allowed developers to erect high-rise buildings.
• D) They were outdated and slowed the growth of cities.
• E) They demonstrated the value of female ingenuity.