In both the USA and Bulgaria there is the principle of the division of powers - legislative, executive and judiciary. This division is set up in order to prevent the abuse of power. However, there are some major differences in the two political systems. The legislative brach in the USA, for example, consists of two bodies - House of Representatives and Senate, while in Bulgaria it is just one body - the National Assembly. The role of the President in both countries is very different. It differs in the following ways: in the USA he is the head of the executive branch, while in Bulgaria he is not. In Bulgaria the Prime Minister has the right to negotiate international treaties unlike in the USA, where this power belongs to the President. However, there are some things which are common to the function of the President in both countries: he is head commander of the army and he doesn't have the power to declare war. Also, he has the power of veto and the right to use media in order to build up public support. The main similarity in the US and the Bulgarian political system is that the three branches of power communicate and control each other.