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The original was posted on /r/askhistorians by /u/nerevarine12345 on 2023-08-25 03:38:48+00:00.

Throughout The first 100 years of US history the national republicans, democratic republicans, whigs, and federalists were all dominant political parties at 1 point or another, but since the mid 1800s the republican and Democratic Parties have been the 2 dominant parties. Why is this?