Question: when did the united states entered the first world war
[{'answer': 'December 7 , 1917', 'provenance': [{'wikipedia_id': '25162935', 'title': 'American entry into World War I', 'start_paragraph_id': 102, 'start_character': 80, 'end_paragraph_id': 102, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Declaration of war.:Austria-Hungary.\n'}]}]