Question: what is the dominant ethnic group of southern south america including argentina and uruguay
[{'answer': 'Whites', 'provenance': [{'wikipedia_id': '33309035', 'title': 'Ethnic groups in Latin America', 'start_paragraph_id': 13, 'start_character': 12, 'end_paragraph_id': 13, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Ethnic groups.\n'}]}]