Question: when did texas become part of the usa
[{'answer': '1845', 'provenance': [{'wikipedia_id': '27143322', 'title': 'History of Texas (1845–1860)', 'start_paragraph_id': 0, 'start_character': 18, 'end_paragraph_id': 0, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27143322', 'title': 'History of Texas (1845–1860)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 437, 'bleu_score': 0.524832013041144, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8713824459683349478}, 'section': 'Section::::Abstract.'}]}]