Question: how many american citizens live in the united states
[{'answer': '308 million', 'provenance': [{'wikipedia_id': '19792942', 'title': 'Americans', 'start_paragraph_id': 11, 'start_character': 121, 'end_paragraph_id': 11, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Racial and ethnic groups.:White and European Americans.\n'}]}]