uscities.txt This data is licensed under the GNU Free Documentation License (http://www.gnu.org/copyleft/fdl.html). It uses material from the Wikipedia article List_of_cities_in_the_United_States_with_over_100%2C000_people (http://en.wikipedia.org/wiki/List_of_cities_in_the_United_States_with_over_100%2C000_people). countries.txt This data is licensed under the GNU Free Documentation License (http://www.gnu.org/copyleft/fdl.html). It is a derivative work of the Wikipedia article List_of_countries (http://en.wikipedia.org/wiki/List_of_countries). isocountries.txt This data is public domain and was obtained from: http://www.guavastudios.com/country-list.htm nationalities.txt: This data is public domain and was obtained from: http://www.guavastudios.com/nationalities-list.htm