Question: when was the american public school system established
[{'answer': 'By the year 1870', 'provenance': [{'wikipedia_id': '9083795', 'title': 'History of education in the United States', 'start_paragraph_id': 42, 'start_character': 110, 'end_paragraph_id': 42, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Federal era.\n'}]}, {'provenance': [{'wikipedia_id': '9083795', 'title': 'History of education in the United States', 'start_paragraph_id': 42, 'start_character': 0, 'end_paragraph_id': 42, 'end_character': 401, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16265967987751998824}, 'section': 'Section::::Federal era.\n'}]}]