Where are the YC threads that make sense?<p>Ok, on a somewhat serious note, your questions are not very well stated, but I think you're asking why we don't see development in America at the same scale we saw in the early 1900s.<p>Quite simply, why would we? The industrial revolution lead people into urban areas. Once people we housed in urban areas, those urban areas continued to grow. The 'next Chicago' is probably San Francisco, which is still fairly small compared to the influence it is having on industry.<p>The last 6 years have seen a massive downturn with the GFC, don't expect to see many large developments happening during a real estate crash.