Which architectural product innovation first allowed for the modern glass curtain wall skyscraper design that dominates urban skylines today?

Throughout history, architecture has been shaped by technological breakthroughs and innovative product design. This poll tests your knowledge of how specific product innovations revolutionized architectural practices and possibilities. Can you identify when key material and design innovations fundamentally changed what architects could achieve?

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Float glass process (1959) that enabled production of large, optically perfect glass sheets
Structural silicone sealants (1960s) that could bond glass to frames without mechanical fasteners
Aluminum extrusion manufacturing (1920s) that created lightweight, strong curtain wall frames
Low-E glass coatings (1980s) that improved energy efficiency in glass facades