Question: what two countries in africa remained free from imperial control
[{'answer': 'Ethiopia', 'provenance': [{'wikipedia_id': '286469', 'title': 'Scramble for Africa', 'start_paragraph_id': 1, 'start_character': 397, 'end_paragraph_id': 1, 'end_character': 405, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Liberia', 'provenance': [{'wikipedia_id': '286469', 'title': 'Scramble for Africa', 'start_paragraph_id': 1, 'start_character': 476, 'end_paragraph_id': 1, 'end_character': 483, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '286469', 'title': 'Scramble for Africa', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 379, 'bleu_score': 0.9037333819091621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5596093626904664575}, 'section': 'Section::::Background.\n'}]}]