How many Republican governors has North Carolina had since 1897?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q29468', 'id': 0, 'label': 'Republican Party'}, {'type': 'INTERNAL', 'name_': 'Q4167836', 'id': 1, 'label': 'Wikimedia category'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1454', 'id': 2, 'label': 'North Carolina'}, {'type': 'INTERNAL', 'name_': 'Q6184898', 'id': 3, 'label': 'Category:Arboreta in North Carolina'}, {'type': 'INTERNAL', 'name_': 'Q5559298', 'id': 4, 'label': 'Gibson C. Armstrong'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q7138029', 'id': 5, 'label': 'Category:Republican Party (United States)'}], 'links': [{'name_': 'P31', 'source': 3, 'target': 1, 'label': 'instance of'}, {'name_': 'P971', 'source': 3, 'target': 2, 'label': 'category combines topics'}, {'name_': 'P102', 'source': 4, 'target': 0, 'label': 'member of political party'}, {'name_': 'P19', 'source': 4, 'target': 2, 'label': 'place of birth'}, {'name_': 'P301', 'source': 5, 'target': 0, 'label': "category's main topic"}, {'name_': 'P31', 'source': 5, 'target': 1, 'label': 'instance of'}]}