Question: who has the power to declare war in the us
[{'answer': 'Congress', 'provenance': [{'wikipedia_id': '455614', 'title': 'Declaration of war by the United States', 'start_paragraph_id': 3, 'start_character': 49, 'end_paragraph_id': 3, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '455614', 'title': 'Declaration of war by the United States', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 678, 'bleu_score': 0.9059742337612021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8938559896977600654}, 'section': 'Section::::Abstract.'}]}]