US parties are decentralised for a number of reasons. Firstly, America is a federal democracy, meaning that the power of the government is not centralised into one body - instead it is divided between the states - the states having as much power and authority as the central government. The decision for America to be a federal country exists because in the years after the War of Independence it was found that the states couldn't agree on certain things, such as trade and that in order for America to become a stable country power had to be given to each individual state so it could decide for itself how it wanted to organise certain aspects. The aspect of State representation is one of these aspects and this means that a State has a certain number of Representatives based on how big the population of a state is, and a set number of Senators. …
