Administrative law governs the decision-making of government administrative agencies and ensures they follow proper procedures. It expanded in the 12th century as more agencies were created to regulate social, economic, and political spheres. Administrative law checks abuse of government power, ensures impartiality and accountability of officials to citizens, and protects citizen rights from overreach. It also divides government into three branches: the legislature that makes laws, the judiciary that interprets laws, and the executive that implements laws.