Where is the Aztec city-state Tenochtitlan located?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q13695', 'id': 0, 'label': 'Tenochtitlan'}, {'type': 'INTERNAL', 'name_': 'Q335525', 'id': 1, 'label': 'Acamapichtli'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q12542', 'id': 2, 'label': 'Aztec'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q6215340', 'id': 3, 'label': 'Category:Aztec'}], 'links': [{'name_': 'P35', 'source': 0, 'target': 1, 'label': 'head of state'}, {'name_': 'P19', 'source': 1, 'target': 0, 'label': 'place of birth'}, {'name_': 'P27', 'source': 1, 'target': 2, 'label': 'country of citizenship'}, {'name_': 'P910', 'source': 2, 'target': 3, 'label': "topic's main category"}]}