Question: who did the united states acquire texas from
[{'answer': 'Mexico', 'provenance': [{'wikipedia_id': '27143322', 'title': 'History of Texas (1845–1860)', 'start_paragraph_id': 1, 'start_character': 148, 'end_paragraph_id': 1, 'end_character': 154, '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': 3837849955988992915}, 'section': 'Section::::Abstract.'}]}]