Question: when did the french enter the american revolution
[{'answer': '1778', 'provenance': [{'wikipedia_id': '2973792', 'title': 'France in the American Revolutionary War', 'start_paragraph_id': 1, 'start_character': 187, 'end_paragraph_id': 1, 'end_character': 191, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]