I want to know
what is the difference between political system and government ?
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A Government is an entity that governs a certain group of people. One of its main distinguishing features is the monopoly on the legal use of force.
A Political System is a general set of principles, ideals and limitations that are followed by a government regardless of the more specific goals of that particular government.
For example, we can say that even though the Democrat and Republican parties have vastly different goals, they both follow the general outline of Democracy as a political system when they're in control of the government(this is oversimplifying it of course, but I think it's not necessary to go into detail).
The government may be defined in two ways: 1) Collective body of a state's executive power; 2) All bodies of a state (sometimes - local bodies of the states or other subjects of a federation as in the case of the USA) power; A political system is a concept introduced in Political science by David Easton in 1950-s. It is connected with some social relations and interactions and participants of both latter. All of them deal with authoritative allocation of goods in society. Not state alone is part of the political system. Political parties, voters, etc. also are elements of the latter.