Question: who was the last president to receive a and actual formal declaration of war from congress
[{'answer': 'President Franklin Roosevelt', 'provenance': [{'wikipedia_id': '455614', 'title': 'Declaration of war by the United States', 'start_paragraph_id': 4, 'start_character': 192, 'end_paragraph_id': 4, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '455614', 'title': 'Declaration of war by the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 414, 'bleu_score': 0.8495863203660641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14627532513748401774}, 'section': 'Section::::Abstract.'}]}]