Question: when was most of the continental us deforested
[{'answer': 'prior to 1910', 'provenance': [{'wikipedia_id': '23178430', 'title': 'Deforestation in the United States', 'start_paragraph_id': 1, 'start_character': 352, 'end_paragraph_id': 1, 'end_character': 365, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23178430', 'title': 'Deforestation in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 540, 'bleu_score': 0.802893872668291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14438536888707585361}, 'section': 'Section::::Abstract.'}]}]