Question: who was the president during spanish american war
[{'answer': 'McKinley', 'provenance': [{'wikipedia_id': '28265', 'title': 'Spanish–American War', 'start_paragraph_id': 2, 'start_character': 536, 'end_paragraph_id': 2, 'end_character': 544, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28265', 'title': 'Spanish–American War', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 1490, 'bleu_score': 0.9917524012752491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3929642164733979187}, 'section': 'Section::::Path to war.:US response.\n'}]}]