qnli question: Which article stipulates that the structure of each Federal State's government must "conform to the principles of republican, democratic, and social government, based on the rule of law"? sentence: The states are parliamentary republics and the relationship between their legislative and executive branches mirrors that of the federal system: the legislatures are popularly elected for four or five years (depending on the state), and the Minister-President is then chosen by a majority vote among the Landtag's members.