Is political polarization worse than it's been in the past?

Whether political polarization is "worse" today than in the past depends heavily on how it is measured and which historical eras are used as a comparison.

By almost every metric used by political scientists, polarization in the United States is at its highest level in over a century. However, when viewed through the full lens of American history, today’s divisions, while severe, still fall short of the ultimate geographical and physical fracturing of the Civil War.

A breakdown of how today's political environment compares to the past reveals several key insights.

1. Why Today's Polarization is Uniquely Severe

Modern political scientists distinguish between two types of polarization: ideological (disagreeing on policy) and affective (disliking the other side). Today, both have reached historic highs:

•The Rise of "Affective" Polarization: The most striking feature of modern politics is not just that Americans disagree on policy, but that they actively dislike and distrust those on the other side. According to Pew Research Center data, the share of partisans who view the opposing party as "immoral" or a threat to the nation's well-being has skyrocketed over the last decade. Politics has transitioned from a debate over governance to a clash of cultural identities.

•Complete Ideological "Sorting": In the mid-20th century, both parties were ideologically diverse. There were conservative Southern Democrats and liberal Northeast Republicans. Today, the parties have "sorted". Virtually all Democrats are liberal-to-moderate, and virtually all Republicans are conservative-to-moderate.

•The Death of the Political Moderate: Political scientists track legislative voting patterns using "NOMINATE" scores. Today, the ideological overlap between the two parties in Congress has effectively shrunk to zero. There are almost no moderate bridge-builders left in federal office, leading to constant gridlock.

•The 2008 Inflection Point: A study by Cambridge University’s Political Psychology Lab found that while U.S. polarization was relatively flat in the 1990s and early 2000s, it exploded after 2008. This pivot point aligned with the global financial crisis, the rapid rise of smartphones and social media algorithms, and shifting demographics, which hyper-charged divisions.

•An International Outlier: Research from Brown and Stanford universities indicates that while many countries are experiencing political divides, the U.S. has polarized faster and more deeply over the last 40 years than other comparable Western democracies (such as Canada, the UK, Germany, and Sweden).

2. Historical Comparisons: Is This Unprecedented?

To understand if this is the "worst" it has ever been, historians point to three distinct eras of American history:

The Mid-20th Century "Consensus" (1950s–1970s)

•The Comparison: Today is vastly more polarized than this era. Post-WWII America was defined by a high degree of bipartisanship and trust in institutions.

•The Nuance: Historians warn against treating the mid-20th century as a "normal" baseline. That era of consensus was an anomaly, largely forged by the unifying pressure of the Cold War and a shared media landscape (just three major TV networks). Furthermore, this "consensus" often masked brutal, unresolved struggles over civil rights and Jim Crow, which did not neatly align with party divisions at the time.

The Gilded Age & Reconstruction (1870s–1900)

•The Comparison: Today’s legislative gridlock and parity are highly comparable to the Gilded Age.

•The Nuance: During the late 19th century, control of Congress flipped constantly, party loyalty was absolute, and political rhetoric was incredibly vitriolic. However, the Gilded Age was primarily polarized around economic issues (tariffs, labor, currency). What makes today potentially more volatile is that modern polarization combines the economic divides of the Gilded Age with deeply personal, moral, and cultural disagreements.

The Pre-Civil War Era (1840s–1860s)

•The Comparison: This remains the absolute benchmark for American polarization, and today’s political environment—as tense as it is—does not match it.

•The Nuance: In the 1850s, polarization was regional and territorial. The North and South were physically divided over a singular, existential moral issue: slavery. This geographical divide allowed for physical secession and a military war that cost hundreds of thousands of lives.

•Today's polarization is sectarian but nationwide. The primary divide is urban vs. rural, meaning red and blue voters live side-by-side in every state. Because the divide is not regional, there is no physical border to split, and there is virtually no organized political will for a physical civil war.

Summary

If you compare today to the lifetime of any living American, political polarization is worse than it has ever been. The complete disappearance of political moderates, the tribal hatred between the parties, and the media ecosystems that feed them are historically unprecedented in modern times.

However, if you look at the broad arc of American history, we have survived similar peaks of polarization. Today’s era is a return to the intense, gridlocked partisan warfare of the Gilded Age, though it still remains a far cry from the nation-shattering crisis of the Civil War.

Citations (13)

1wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “By almost every metric used by political scientists, polarization in the United States is at its highest level in over a century.”
2usc.eduAcademic
usc.edu
Backs: “By almost every metric used by political scientists, polarization in the United States is at its highest level in over a century.”
3usc.eduAcademic
usc.edu
Backs: “However, when viewed through the full lens of American history, today’s divisions, while severe, still fall short of the ultimate geographical and physical fracturing of the Civil War.”
4democracyproject.orgNonprofits and think tanks
democracyproject.org
Backs: “However, when viewed through the full lens of American history, today’s divisions, while severe, still fall short of the ultimate geographical and physical fracturing of the Civil War.”
5brown.eduAcademic
brown.edu
Backs: “The Rise of "Affective" Polarization: The most striking feature of modern politics is not just that Americans disagree on policy, but that they actively dislike and distrust those on the other side. According to Pew Research Center data, the share of partisans who view the opposing party as "immoral" or a threat to…”
6syr.eduAcademic
syr.edu
Backs: “According to Pew Research Center data, the share of partisans who view the opposing party as "immoral" or a threat to the nation's well-being has skyrocketed over the last decade. Politics has transitioned from a debate over governance to a clash of cultural identities.”
7quora.comForums and Q&A
quora.com
Backs: “Politics has transitioned from a debate over governance to a clash of cultural identities. Complete Ideological "Sorting": In the mid-20th century, both parties were ideologically diverse.”
8econlib.orgEncyclopedias and reference
econlib.org
Backs: “Complete Ideological "Sorting": In the mid-20th century, both parties were ideologically diverse. There were conservative Southern Democrats and liberal Northeast Republicans.”
9wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “Complete Ideological "Sorting": In the mid-20th century, both parties were ideologically diverse. There were conservative Southern Democrats and liberal Northeast Republicans.”
10cam.ac.ukAcademic
cam.ac.uk
Backs: “Today, the parties have "sorted". Virtually all Democrats are liberal-to-moderate, and virtually all Republicans are conservative-to-moderate.”
11gallup.comCompanies
gallup.com
Backs: “Virtually all Democrats are liberal-to-moderate, and virtually all Republicans are conservative-to-moderate.”
12carnegieendowment.orgNonprofits and think tanks
carnegieendowment.org
Backs: “The Nuance: During the late 19th century, control of Congress flipped constantly, party loyalty was absolute, and political rhetoric was incredibly vitriolic. However, the Gilded Age was primarily polarized around economic issues (tariffs, labor, currency).”
13brookings.eduNonprofits and think tanks
brookings.edu
Backs: “However, the Gilded Age was primarily polarized around economic issues (tariffs, labor, currency). What makes today potentially more volatile is that modern polarization combines the economic divides of the Gilded Age with deeply personal, moral, and cultural disagreements.”