Question: when did america send troops to europe in world war 2
[{'answer': '22 June 1941'}, {'provenance': [{'wikipedia_id': '4653534', 'title': 'Military history of the United States during World War II', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 1374, 'bleu_score': 0.8625553255471531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3293793974593002516}, 'section': 'Section::::Lend-Lease and Iceland Occupation.\n'}]}]