Question: which war during the mid 1800s weakened the economy of the ottoman empire
[{'answer': 'Russo - Turkish War', 'provenance': [{'wikipedia_id': '1084650', 'title': 'Decline and modernization of the Ottoman Empire', 'start_paragraph_id': 87, 'start_character': 429, 'end_paragraph_id': 87, 'end_character': 449, 'bleu_score': 1.0, 'section': 'Section::::Istibdat 1879-1908.:1879–1908 Abdul Hamid II.:Armenians, 1890s.:Autonomists.\n'}]}, {'provenance': [{'wikipedia_id': '1084650', 'title': 'Decline and modernization of the Ottoman Empire', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 1040, 'bleu_score': 0.94639902147812, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16203622495076483229}, 'section': 'Section::::First Constitutional Era, 1876–1878.:1876–1879 Abdul Hamid II.:Russo-Turkish War 1877–1878.\n'}]}]