Question: when did separation of church and state became law
[{'answer': '1878', 'provenance': [{'wikipedia_id': '596325', 'title': 'Separation of church and state in the United States', 'start_paragraph_id': 50, 'start_character': 57, 'end_paragraph_id': 50, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Early history.:Jefferson, Madison, and the "wall of separation".\n'}]}, {'provenance': [{'wikipedia_id': '596325', 'title': 'Separation of church and state in the United States', 'start_paragraph_id': 86, 'start_character': 0, 'end_paragraph_id': 86, 'end_character': 1002, 'bleu_score': 0.9873810715615521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1929821177441954202}, 'section': 'Section::::Supreme Court cases.\n'}]}]