Conversely, in a federal constitution, power is divided between national (or 'federal') government and states or regional authorities. This model is generally established in a constitutional document, for example the German and US Constitutions. Some powers, like state security and foreign policy, are likely to be reserved to central government, butthe regional authorities (such as the individual states in the USA or the German 'Bundesländer') have considerable powers to legislate on and administer their own affairs.