We have not had checks and balances since 1803, Marbury v. Madison. Judicial review was why slavery could not be abolished in the United States. The English were able to abolish slavery because William and Mary stopped judicial interference with Parliament after James II was driven from the throne. The only time the Supreme Court has not been the strongest branch of government since 1803 was when Lincoln wrote the Emancipation Proclamation and had it ratified by Congress, but it took a Civil War to get that to happen. By saying the Supreme Court has the power to tax, Roberts just declared himself king. Supreme Court justices are appointed for life.