Question: when was the treaty of guadalupe hidalgo signed
[{'answer': 'February 2 , 1848', 'provenance': [{'wikipedia_id': '165381', 'title': 'Treaty of Guadalupe Hidalgo', 'start_paragraph_id': 1, 'start_character': 243, 'end_paragraph_id': 1, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '165381', 'title': 'Treaty of Guadalupe Hidalgo', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 459, 'bleu_score': 0.893032352987798, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3402456990623371026}, 'section': 'Section::::Abstract.'}]}]