home country; country of origin
Refers to the country where a person was born or originally comes from. Often used in formal contexts such as immigration forms or official documents.
Please fill in your country of origin.
His home country is Brazil.
母国 is a more emotional term for one's motherland or homeland, whereas 出身国 is a neutral, factual term for country of origin.
Compound of 出身 (shusshin, 'origin') and 国 (koku, 'country').