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It will be almost impossible for any third party to compete with the power and backing of the GOP and the Democratic party. They are both corrupt, elitist, and moving the country in a direction that is more authoritarian than the American ideal should allow.
There are two narratives being told in America, and it's caused pretty much everybody to forget that most problems have more than two possible solutions—and most issues have more than two sides. The plurality of ideas that is necessary in a free country requires the promotion of more parties.