Which factor largely accounts for the failure of the U.S.electoral system to produce a third party that rivals the Democrats and Republicans?

Question

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The combination of single-member districts and a plurality voting system largely accounts for the failure of the U.S. electoral system to produce a third party that rivals the Democrats and Republicans. In a single-member district system, only one representative is elected from a specific geographic area, making it more difficult for third party candidates to gain a foothold. The plurality voting system, where the candidate with the most votes wins even if they don't have a majority, pushes voters to choose between the two major parties, as voting for a third party candidate may be seen as wasting their vote. This creates a "two-party system" in which third party candidates struggle to gain significant support.

Which Factor Largely Accounts for the Failure of the U