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Las Vegas is small and not a lot of population in it. This is good considering the fact that before they didn't have cars and had to walk. so to have a small city is good because you have to walk small distances to get to places.
Source: https://earthengine.google.com/timelapse/

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Now Las Vegas has increased in population with means they have to build more houses and more airports.
Source: https://earthengine.google.com/timelapse/

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In the past there were no airplane back in the olden days therefore people found it hard to travel or could not travel by boat since back then it was expensive. https://www.google.co.th/search?safe=strict&biw=1280&bih=628&tbm=isch&sa=1&ei=H0T6WsvaIoTzvgTX8IkY&q=las+vegas+past&oq=Las+Vegas+past&gs_l=img.3.0.0l2j0i8i30k1l8.4136.9029.0.12459.6.6.0.0.0.0.171.580.2j3.5.0....0...1c.1.64.img..1.3.358...0i7i30k1.0.pKQcjgWhj7I#imgrc=ZmDvnTll8uJDeM:

# data[].attributes.body
However now many people can afford to travel for work or family increasing the population as a result making the government build more buildings using up the land.  https://www.google.co.th/search?q=Las+vegas+2018&safe=strict&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjZjbWO4YbbAhULpY8KHXEYDwYQ_AUICigB&biw=1280&bih=628#imgrc=EiHuSmP5K_O1YM: