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Party - an alternative definition: An association of people with similar interests that may share a philosophical view. For example, rich liberals and poor black and Latinos in the American Democratic Party and poor white Christians and Wall Street Bankers in the Republican party. In this example some parts of philosophy and some interests are shared, but not all or many.

Political groups have existed for a long time. One important example are the Guelphs and Ghibellines who fought for centuris over the way that the Holy Roman Empire should be administered.