The political system of USA

The USA is a federal union of 50 states. The basic law is the constitution, adopted in 1787, which prescribes the structure of national government and lists its rights and fields of authority. Each state has its government and all of them have the dual character of both Federal and State government. The political system of the USA is divided into three branches: judicial, legislative and executive. Each branch holds a certain degree of power over the others, and all take part in the governmental process.