The industrial age saw even greater advancements in urban pl

The industrial age saw even greater advancements in urban planning then architecture. Early modern architects and city planners had been called upon to build entire cities from scratch, such as Washington, D.C. in the United States, and St. Petersburg in Russia, while other cities like Paris were completely transformed, gaining a new feeling of spaciousness and regularity. But, the first truly modern buildings arose not in Paris, but in the North American heartland. Where were the first modern skyscrapers built, and who designed them? What are some of the main features of these buildings? Provide examples.