Question: when did it become illegal to kill bald eagles
[{'answer': '1940', 'provenance': [{'wikipedia_id': '18185526', 'title': 'Bald and Golden Eagle Protection Act', 'start_paragraph_id': 1, 'start_character': 304, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18185526', 'title': 'Bald and Golden Eagle Protection Act', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 950, 'bleu_score': 0.9876155018005031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1986419726559197140}, 'section': 'Section::::Abstract.'}]}]