Final answer:
The Willis Tower, initially known as the Sears Tower, became the world's tallest building in 1973 until it was surpassed by the Petronas Towers in 1996. It's part of Chicago's rich history in skyscraper innovation, starting with the Home Insurance Building, the pioneering skyscraper of its time.
Step-by-step explanation:
The Willis Tower (formerly the Sears Tower) in Chicago was recognized as the world's tallest building when it was completed in 1973. Utilizing revolutionary construction technologies, such as steel frames, the skyscraper was not only elevated to impressive heights but also imbued with strength and a lighter structure. The Willis Tower held the title of the tallest building in the world until the completion of the Petronas Towers in Kuala Lumpur, Malaysia, in 1996. However, it is important to note that throughout history, Chicago has been a pioneering city in skyscraper construction, with the Home Insurance Building being regarded as the first skyscraper ever built. Going further back, the Woolworth Building in New York held the title from 1913 until the Chrysler Building took over in 1930. Later, the advent of new architectural marvels like One World Trade Center in New York and the Burj Khalifa in Dubai redefined the limits of skyscraper heights.