Question: what is the largest ethnic group in the united states
[{'answer': 'white Americans', 'provenance': [{'wikipedia_id': '3058522', 'title': 'Race and ethnicity in the United States', 'start_paragraph_id': 129, 'start_character': 363, 'end_paragraph_id': 129, 'end_character': 378, 'bleu_score': 1.0, 'section': 'Section::::Racial makeup of the U.S. population.:Two or more races.:Genetic admixture.\n'}]}, {'provenance': [{'wikipedia_id': '3058522', 'title': 'Race and ethnicity in the United States', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 418, 'bleu_score': 0.671915612470616, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6391467562274496296}, 'section': 'Section::::Abstract.'}]}]