Question: what was the intent of the northern expedition
[{'answer': 'to reunify China', 'provenance': [{'wikipedia_id': '233102', 'title': 'Northern Expedition', 'start_paragraph_id': 1, 'start_character': 270, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '233102', 'title': 'Northern Expedition', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 771, 'bleu_score': 0.502455507074686, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10479727956441890160}, 'section': 'Section::::Abstract.'}]}]