Qing China achieved its greatest height under the rule of O Qian-Long
O Empress Cixi
O Zheng He
O Lao Tzu

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv