Question: who was the first european explorer to explore land that became part of the united states
[{'answer': 'Ponce de Leon', 'provenance': [{'wikipedia_id': '24490545', 'title': 'Exploration of North America', 'start_paragraph_id': 13, 'start_character': 670, 'end_paragraph_id': 13, 'end_character': 683, 'bleu_score': 1.0, 'section': 'Section::::Further nautical explorations.\n'}]}, {'provenance': [{'wikipedia_id': '24490545', 'title': 'Exploration of North America', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 760, 'bleu_score': 0.9846731957240711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11266487661118984416}, 'section': 'Section::::Further nautical explorations.\n'}]}]