Question: when was the gettysburg national military park established
[{'answer': '1895', 'provenance': [{'wikipedia_id': '1895450', 'title': 'Gettysburg National Military Park', 'start_paragraph_id': 5, 'start_character': 321, 'end_paragraph_id': 5, 'end_character': 325, 'bleu_score': 1.0, 'section': 'Section::::Federal land acquisition.\n'}]}]