Question: why is ancient greece often labeled the start of western civilization
[{'answer': 'first democratic system of government', 'provenance': [{'wikipedia_id': '21208262', 'title': 'Western culture', 'start_paragraph_id': 3, 'start_character': 168, 'end_paragraph_id': 3, 'end_character': 201, 'bleu_score': 0.668740304976422, 'section': 'Section::::Abstract.'}]}, {'answer': 'advances in philosophy , science and mathematics'}, {'provenance': [{'wikipedia_id': '21208262', 'title': 'Western culture', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1555, 'bleu_score': 0.6311691637152941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1880130862262852092}, 'section': 'Section::::Abstract.'}]}]