Which fourth era of American political party history which began in 1968 is characterized by?

The fourth era of American political party history, which began in 1968, is characterized by increasing polarization and the emergence of a more ideologically divided electorate. This period saw the realignment of party affiliations, particularly with the Democratic Party becoming more associated with liberal and progressive movements, while the Republican Party shifted towards conservatism. Additionally, issues such as civil rights, the Vietnam War, and economic changes played significant roles in shaping party identities and voter behavior during this era. The rise of independent voters and the influence of media also marked this transformative period in American politics.