Question: what happened to most european colonies in africa after ww2
[{'answer': 'Decolonisation', 'provenance': [{'wikipedia_id': '1815296', 'title': 'Decolonisation of Africa', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]