Invasion of the steel skeletons In the 1880s and 1890s, a new building method was introduced in Chicago. It was known as steel- cage construction. In place of stone, a steel skeleton, or cage, was used as the main support for a building. Improvements in elevator technology allowed for quick movement between floors within these structures. As a result, office buildings, department stores and apartment buildings grew ever taller. These buildings transformed the skylines of cities such as Chicago, New York City, and, eventually, most other large cities in the world. These tall buildings, in turn, created even greater concentrations of workers who used trains and subways to get to their jobs. 1.What led to the rapid growth of cities following the Agricultural Revolution? 2.In what way did the Industrial Revolution determine where new cities were built? 3. How did the Industrial Revolution lead to changes in transporation and infrastructure? 4.According to the article, HOW were people living in cities exposed to health risks? 5.What was the impact of steel-cage construction on growing cities?