Question: who was the great wall of china built to defend against
[{'answer': 'nomads from Inner Asia', 'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'start_paragraph_id': 1, 'start_character': 299, 'end_paragraph_id': 1, 'end_character': 321, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'nomads from Inner Asia .', 'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'start_paragraph_id': 1, 'start_character': 299, 'end_paragraph_id': 1, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 454, 'bleu_score': 0.7789407038334321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4335811478246670008}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771476) and Warring States periods (475221) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221206) against incursions by nomads from Inner Asia.', 'The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771476) and Warring States periods (475221) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221206) against incursions by nomads from Inner Asia.', 'The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771476) and Warring States periods (475221) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221206) against incursions by nomads from Inner Asia. The walls were built of rammed earth, constructed using forced labour, and by 212 ran from Gansu to the coast of southern Manchuria.\rhighlight sentence(s) containing evidence, not only the answer']}}]}]