Question: when did the british empire reach its peak
[{'answer': '19th century', 'provenance': [{'wikipedia_id': '4721', 'title': 'British Empire', 'start_paragraph_id': 3, 'start_character': 391, 'end_paragraph_id': 3, 'end_character': 403, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4721', 'title': 'British Empire', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1191, 'bleu_score': 0.9448972118628141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9687871899770124727}, 'section': 'Section::::Abstract.'}]}]