Question: in the 1930s what caused canada to respond by raising tax on goods imported from the united states
[{'answer': 'Great Depression', 'provenance': [{'wikipedia_id': '3873491', 'title': 'Tariff in United States history', 'start_paragraph_id': 64, 'start_character': 437, 'end_paragraph_id': 64, 'end_character': 453, 'bleu_score': 1.0, 'section': 'Section::::1860–1912.:McKinley tariff policy.\n'}]}, {'provenance': [{'wikipedia_id': '3873491', 'title': 'Tariff in United States history', 'start_paragraph_id': 71, 'start_character': 0, 'end_paragraph_id': 71, 'end_character': 999, 'bleu_score': 0.9874601949752461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8934066754626510222}, 'section': 'Section::::1913 to present.\n'}]}]