What important role do third parties often play in us national elections?

The third parties in the United States national elections play the vital role of  breaking up major parties' dominance. The electoral system in the US cosnsits of two main parties. Nevertheless, third parties exists whith the purpose of  ensuring that the electorate who will cast their ballots have other options to choose. Furthermore, they also raise awareness for different issues to deal with and provide different perspectives, which the major parties should tackle.

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.