What concepts are described in the following sentence?

"A Fortress of Grey Ice was originally published in English (the language of Great Britain) . In the United States, Barack Obama is the leader and native Americans are an ethnic Group."

Return the answer as pairs of triples.
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