Writing in the early 20th century, Max Weber believed that a definitive feature of a developed state had come to be its bureaucratic support. The head of state is apart from the executive, and symbolically enacts laws and acts as representative of the nation. Examples include the President of Germany , the Queen of the United Kingdom , and the President of Austria . The other important model is the presidential system, found in the United States and in Brazil. In presidential systems, the executive acts as both head of state and head of government, and has power to appoint an unelected cabinet.
- The military and police carry out enforcement at the request of the government or the courts.
- In civil law the sources recognised as authoritative are, primarily, legislation—especially codifications in constitutions or statutes passed by government—and custom.
- Given the trend of increasing global economic integration, many regional agreements—especially