Answering other questions about nineteenth-century architecture - AP Art History

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Question

The particular innovation that allowed large-scale skyscrapers to be built was                     .

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Answer

Until the late nineteenth century, buildings had serious vertical size restrictions due to the weight placed on them by bricks and other traditional materials. With the introduction of steel, an alloy of iron, new possibilities were available to builders. In particular, the use of steel-frame construction, which built a "sheet" around steel beams, allowed for buildings stretching taller than ten stories.

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