Question: what form of government does the united states use
[{'answer': 'republic', 'provenance': [{'wikipedia_id': '195149', 'title': 'Federal government of the United States', 'start_paragraph_id': 1, 'start_character': 129, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '195149', 'title': 'Federal government of the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 656, 'bleu_score': 0.8457247368363591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13654979040965044093}, 'section': 'Section::::Abstract.'}]}]