Question: when did the british empire start to end
[{'answer': '1945', 'provenance': [{'wikipedia_id': '4721', 'title': 'British Empire', 'start_paragraph_id': 62, 'start_character': 28, 'end_paragraph_id': 62, 'end_character': 32, 'bleu_score': 1.0, 'section': "Section::::Britain's imperial century (1815–1914).:Changing status of the white colonies.\n"}]}, {'provenance': [{'wikipedia_id': '4721', 'title': 'British Empire', 'start_paragraph_id': 79, 'start_character': 0, 'end_paragraph_id': 79, 'end_character': 1590, 'bleu_score': 0.9283659788446281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5452217194920141387}, 'section': 'Section::::Decolonisation and decline (1945–1997).\n'}]}]