Political realignment
Set of sharp changes in ideology, issues, leaders, regional and demographic bases of power of political parties, and the structure or rules of the political system, resulting in a new political power structure replacing an older dominant coalition
A political realignment, often called a critical election, critical realignment, or realigning election, in the academic fields of political science and political history, is a set of sharp changes in party ideology, issues, party leaders, regional and demographic bases of power of political parties, and the structure or rules of the political system, such as voter eligibility or financing. The ch... Wikipedia