to share – to copy, distribute and transmit the work. This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. GFDL GNU Free Documentation License true true A copy of the license is included in the section entitled GNU Free Documentation License. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. The image below shows how three Midwestern cities - Indianapolis, Indiana Cincinnati, Ohio and Dayton, Ohio - grew dramatically during that time period.JimIrwin at the English-language Wikipedia, the copyright holder of this work, hereby publishes it under the following license: During the period of rapid development from 1910 to 2010, the US population density more than tripled. Unsurprisingly, the researchers determined that where people built was strongly associated with where people lived. These records allowed them to zoom in on individual areas - down to the size of a large office building or shopping center - over the course of two centuries. The Colorado researchers found that property records from the real estate company Zillow provided a clearer portrait of urban development. Census data, meanwhile, is often missing prior to the mid-20th century. Satellite images only date back to the 1970s and often lack detail. But there were limitations to those data sets. Prior to the University of Colorado Boulder study, historians had mostly used two methods to examine urban development: census records indicating where peopled lived, and satellite imagery showing how land was used over time. How the US went from mostly rural to mostly urban "Such new knowledge is highly relevant as it will tell us more about exposure of the built environment to coastal hazards, or wildfire - and hopefully teach us lessons what can be improved to avoid problematic developments in the past," Stefan Leyk, the study's lead author, told Business Insider. It may also help illuminate which cities have been ravaged the most by natural disasters. In the future, this research could be overlaid with demographic data to determine how Americans of various ages, races, and ethnicities inhabited certain areas over time - offering a window into patterns of poverty and displacement. In many cases, the researchers found, individual counties started to develop even before their respective states were declared part of the US. Denver developed much earlier than the rest of Colorado, and Miami developed late compared to the rest of the South, which the authors attribute to Florida's rough terrain. While the common narrative is that urban expansion moved westward over time in the US, the researchers discovered exceptions to that rule. Phoenix and Miami were built up later, around the mid-1900s, but by 2010, they were more widely developed than the other three cities. Seattle, Washington, DC, and Denver landed on the map around the turn of the 20th century. Rochester developed first around the mid-1800s. Account icon An icon in the shape of a person's head and shoulders.
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