Question: when did immigration start in the united states
[{'answer': '1607', 'provenance': [{'wikipedia_id': '14599622', 'title': 'History of immigration to the United States', 'start_paragraph_id': 4, 'start_character': 3, 'end_paragraph_id': 4, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Colonial Era.\n'}]}, {'provenance': [{'wikipedia_id': '14599622', 'title': 'History of immigration to the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 212, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12357179838794465862}, 'section': 'Section::::Colonial Era.\n'}]}]