Question: when did american samoa become a us territory
[{'answer': '1899', 'provenance': [{'wikipedia_id': '20611195', 'title': 'American Samoa', 'start_paragraph_id': 19, 'start_character': 116, 'end_paragraph_id': 19, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::History.:20th century.:Early 20th century.\n'}]}, {'provenance': [{'wikipedia_id': '20611195', 'title': 'American Samoa', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 802, 'bleu_score': 0.985238839858627, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9946426588399139890}, 'section': 'Section::::History.:20th century.:Early 20th century.\n'}]}]