Question: when did the most polish immigrants come to america
[{'answer': 'from 1870 to 1914', 'provenance': [{'wikipedia_id': '38965731', 'title': 'History of the Poles in the United States', 'start_paragraph_id': 2, 'start_character': 78, 'end_paragraph_id': 2, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38965731', 'title': 'History of the Poles in the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1127, 'bleu_score': 0.9580807684881931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9308779761282552062}, 'section': 'Section::::Abstract.'}]}]