Question: who was the president when texas became a state
[{'answer': 'James K. Polk', 'provenance': [{'wikipedia_id': '27143322', 'title': 'History of Texas (1845–1860)', 'start_paragraph_id': 4, 'start_character': 344, 'end_paragraph_id': 4, 'end_character': 357, 'bleu_score': 1.0, 'section': 'Section::::Annexation.\n'}]}, {'provenance': [{'wikipedia_id': '27143322', 'title': 'History of Texas (1845–1860)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 872, 'bleu_score': 0.985238839858627, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12174306341542596231}, 'section': 'Section::::Annexation.\n'}]}]