A Fortress of Grey is from the United States and published in English, which is also spoken in Great Britain. Barack Obama is the president of the US and Native Americans are an ethnic group.
[['United States', 'LEADER_NAME', 'Barack Obama'], ['A Fortress of Grey Ice', 'LANGUAGE', 'English language'], ['English language', 'SPOKEN_IN', 'Great Britain'], ['A Fortress of Grey Ice', 'COUNTRY', 'United States'], ['United States', 'ETHNIC_GROUP', 'Native Americans in the United States']]