You may enjoy this interesting series of interactive data visualizations showing land use in the continental United States based on different categorizations used by the US Department of Agriculture. I found it interesting when you organize all the categories together that pasture and rangeland would take up most of the Western US and all of the country’s cities and towns would fit in the Northeast. Check it out!
SoCalGIS.org 
Interesting. Just flew back from Canada over Eastern Oregon/Nevada. What is classified as “Pasture/Range” I would label “wasteland”. It is essentially unusable. We forget how much of this country is empty because it is not easy to habitate.