Which building product, introduced in the 1880s, revolutionized architecture by enabling the creation of skyscrapers and fundamentally changing urban skylines worldwide?

The architecture industry has seen numerous innovative products that have revolutionized design possibilities. From traditional materials to cutting-edge solutions, architects have continually pushed boundaries by incorporating new products into their creations. This trivia question tests your knowledge about a transformative material that changed the course of modern architecture and opened up new design frontiers. Do you know which product sparked a revolution in architectural possibilities?

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Structural steel frames
Reinforced concrete
Plate glass
Aluminum cladding