Final answer:
Cast iron was the key medium in mid-nineteenth-century architecture, revolutionizing construction with its innovative techniques.
Explanation:
Cast iron was the most important new medium in mid-nineteenth-century architecture. Innovations like the Crystal Palace by Joseph Paxton showcased the early use of iron and glass construction techniques during this period.
The Industrial Revolution popularized the use of steel, plate glass, and mass-produced components in architecture, paving the way for bold structural frames with clean lines and plain surfaces.
In America during the mid-19th century, the development of cheap, versatile steel was a significant factor in transforming the urban landscape and enabling the construction of skyscrapers.
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