Final answer:
A critical election signifies a significant and lasting change in voter allegiances, affecting the political landscape.
Explanation:
Critical election refers to an election that marks a sudden, clear, and long-term shift in voter allegiances, leading to realignment in American politics. An example of this is the 1932 election when Franklin Roosevelt won, initiating a shift towards the Democratic Party and their New Deal coalition, showcasing the impact of critical elections on political dynamics.
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