How did Louis Sullivan and William Jenner change the face of American cities in the late 1800s?

Louis Sullivan and William Jenney were pivotal in transforming American cities in the late 1800s through their innovative architectural designs. Sullivan, known as the "father of skyscrapers," emphasized the use of steel frames and large Windows, allowing for taller and more functional buildings that defined urban skylines. Jenney, as one of the first to use a steel frame in construction, helped to revolutionize building techniques, leading to the development of the modern high-rise. Together, their contributions facilitated the growth of vertical urban spaces, reshaping cityscapes and enabling more efficient use of limited urban land.