There have been times in U. S. history when third parties have affected the outcome of an election. If a third party takes disproportionately from one party rather than the other they can be divisive. Ironically, Ross Perot got 19% of the vote in 19...
Third parties in the United States have been unsuccessful largely because of the single-member-plurality system. Whoever comes in first wins the office. In parliamentary systems, the percentage of votes each party gets equates to the percentage of s...