Question: when did the us enter africa in ww2
[{'answer': 'December 1941', 'provenance': [{'wikipedia_id': '493688', 'title': 'North African campaign', 'start_paragraph_id': 2, 'start_character': 298, 'end_paragraph_id': 2, 'end_character': 311, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '493688', 'title': 'North African campaign', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 379, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2404409716763728936}, 'section': 'Section::::Abstract.'}]}]