Question: us imperialism in the late 19th century was supported by which theory
[{'answer': 'Manifest Destiny', 'provenance': [{'wikipedia_id': '215140', 'title': 'American imperialism', 'start_paragraph_id': 7, 'start_character': 346, 'end_paragraph_id': 7, 'end_character': 362, 'bleu_score': 1.0, 'section': 'Section::::History.:Overview.\n'}]}, {'provenance': [{'wikipedia_id': '215140', 'title': 'American imperialism', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 314, 'bleu_score': 0.9611463610973231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4494268660721824150}, 'section': 'Section::::History.:Indian Wars and Manifest Destiny.\n'}]}]