As of the 2010 Census, 80 percent of U.S. citizens lived in urban areas. Human beings are drawn to cities for work, culture, camaraderie and hipster coffee shops (among other things).
Every city starts somewhere. Some plug along, while others take off with growth most inhabitants never imagined. Seattle has been both types of city, from the home of the last person leaving turning out the lights, to construction-crane magnet.