In the context of American government, the term refers to a substantial and durable shift in the party affiliations of voters, resulting in a new political landscape. This transformation involves a significant change in the dominant political party, its ideologies, and its supporting demographics. An example is the election of 1932, where the Democratic Party, led by Franklin D. Roosevelt, gained widespread support due to the Great Depression, ushering in an era of Democratic dominance.
Such shifts are significant because they alter the balance of power and influence policy direction for extended periods. They often reflect profound societal changes, such as economic crises, social movements, or major political issues. The resulting changes in voting patterns, party coalitions, and policy agendas shape the political discourse and government action for decades. Understanding these periods is essential for comprehending the evolution of the American political system and predicting future electoral trends.