Question: why did the us implement the marshall plan
[{'answer': 'rebuild war - devastated regions'}, {'answer': 'remove trade barriers', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 483, 'end_paragraph_id': 1, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'modernize industry', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 506, 'end_paragraph_id': 1, 'end_character': 524, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'make Europe prosperous once more'}, {'answer': 'prevent the spread of communism', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 555, 'end_paragraph_id': 1, 'end_character': 580, 'bleu_score': 0.668740304976422, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 784, 'bleu_score': 0.6465597916701651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 523877228148984235}, 'section': 'Section::::Abstract.'}]}]