Question: when were the hawaiian islands annexed by the united states
[{'answer': 'July 7 , 1898', 'provenance': [{'wikipedia_id': '4286809', 'title': 'Overthrow of the Hawaiian Kingdom', 'start_paragraph_id': 50, 'start_character': 169, 'end_paragraph_id': 50, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Republic, United States annexation, statehood.\n'}]}, {'provenance': [{'wikipedia_id': '4286809', 'title': 'Overthrow of the Hawaiian Kingdom', 'start_paragraph_id': 50, 'start_character': 0, 'end_paragraph_id': 50, 'end_character': 1038, 'bleu_score': 0.9482770842832811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12374481212102717752}, 'section': 'Section::::Republic, United States annexation, statehood.\n'}]}]