Whether political polarization is "worse" today than in the past depends heavily on how polarization is measured and which historical periods are used for comparison.
While many political scientists and historians agree that polarization in the United States and several other democracies is at its highest level in decades, they also point out that history contains periods of equal or even greater division.
To understand this debate, it is helpful to look at the arguments for why polarization is worse today, the historical precedents of deep division, and the different ways polarization is measured.
Arguments That Polarization Is Worse Today
Those who argue that current polarization is unprecedented in modern history point to several key trends:
•Ideological Sorting: In the mid-20th century, both major U.S. parties were "big tents" containing diverse coalitions. The Democratic Party had conservative Southern Democrats, while the Republican Party had liberal Northeastern Republicans. Today, the parties have sorted almost completely: virtually all Democrats are to the left of virtually all Republicans. This has made cross-party compromise much more difficult.
•Elite Polarization: Political scientists track congressional voting behavior using metrics like "DW-NOMINATE," which analyze roll-call votes. These metrics show that members of Congress are further apart ideologically today than at any point since the late 19th century, with fewer moderates in either party.
•Affective Polarization: This refers to how partisans feel about the other side. Studies show a dramatic rise in mutual dislike, distrust, and fear between Democrats and Republicans. Politics has increasingly become tied to personal identity, with people viewing the opposing party not just as wrong on policy, but as a threat to the nation's well-being.
•Media and Technological Changes: The fragmentation of the media landscape—from the rise of talk radio and cable news to social media algorithms—allows individuals to consume information that reinforces their existing beliefs. This has created "echo chambers" that make mutual understanding more difficult than in the era of three dominant broadcast networks.
•Geographic and Cultural Segregation: Americans are increasingly living in communities with like-minded neighbors (geographic sorting), and political affiliation has become highly correlated with other identities, such as race, religion, and education level.
Arguments That Polarization Was Worse in the Past
Many historians argue that while today’s divisions are significant, they do not match the severity of several past eras in American history:
•The Civil War Era (1850s–1860s): This is widely considered the absolute peak of polarization in American history. Ideological and regional divisions over slavery led to the collapse of the party system, the secession of Southern states, and a civil war that resulted in the deaths of hundreds of thousands of Americans. By comparison, current political conflict remains largely within the bounds of democratic institutions.
•The Gilded Age (Late 19th Century): The late 1800s featured intense partisan rivalry, high voter turnout, and deep cultural divisions. Congress was highly polarized, and elections were fought with extreme vitriol. However, the divisions were less ideologically sorted than they are today.
•The 1960s and 1970s: This era was marked by massive civil unrest, riots in major cities, the assassination of key political leaders (including Martin Luther King Jr., Robert F. Kennedy, and John F. Kennedy), and intense conflict over the Vietnam War and civil rights. While political parties themselves were less polarized internally, the societal and cultural divisions were arguably more violent and disruptive than those experienced today.
Distinguishing Types of Polarization
To reconcile these different viewpoints, social scientists distinguish between different forms of division:
1.Ideological Polarization: How far apart people are on policy issues (e.g., tax rates, healthcare). Some research suggests that while political elites (politicians and activists) are highly polarized on policy, the general public remains relatively moderate or divided on specific issues.
2.Affective Polarization: How much partisans dislike each other. Most researchers agree that affective polarization has increased significantly in recent decades, even if actual policy differences among average citizens have not widened as much.
3.Systemic Polarization: The degree to which political divisions align with other social cleavages (like race, religion, geography, and lifestyle). Today’s polarization is unique because these identities have "stacked" on top of party identity, making political disputes feel more existential.
Summary
In the context of the post-World War II era, political polarization is indeed at a record high by almost every metric. The level of partisan animosity, congressional gridlock, and media fragmentation is greater than at any point in the mid-to-late 20th century.
However, in the broader context of all of American history, current divisions, while serious, have not yet reached the level of breakdown seen during the Civil War, nor have they matched the level of widespread political violence and social upheaval seen in the late 1960s.