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

Whether political polarization is worse today than in the past depends entirely on your historical frame of reference.

If you compare today to living memory (the mid-to-late 20th century), polarization is significantly worse. However, if you look at the entire span of American history, the nation has survived eras of equal or even greater division—most notably the Civil War and the Gilded Age.

To understand how today's political division stacks up against the past, political scientists look at two different types of polarization: ideological polarization (how far apart people are on policy issues) and affective polarization (how much they actively dislike and distrust the other side).

1. The Mid-20th Century: An Unusual Benchmark

When people bemoan the loss of bipartisan cooperation, they are usually comparing modern politics to the period between the 1940s and the 1970s.

During this post-World War II era, the two major political parties were not ideologically cohesive. The Democratic Party was a "big tent" that included both liberal northern reformers and deeply conservative southern segregationists. The Republican Party similarly featured both moderate northeasterners and western conservatives. Because of this cross-cutting makeup, compromise was common, and polarization was at an all-time low.

However, historians point out that this era was a historical anomaly, sustained by unique circumstances like the shared trauma of the Great Depression, World War II, and the unifying existential threat of the Cold War.

2. The Worst-Case Scenario: The Civil War (1850s–1860s)

The absolute peak of American polarization was the Civil War era. During this time, polarization was regional, existential, and institutional. The division over slavery was so profound that it physically fractured the nation, led to the collapse of the Whig Party, and resulted in a war that claimed hundreds of thousands of lives.

While modern commentators frequently worry about a "cold civil war" or political violence, today's divisions have not yet led to a total breakdown of the country's geographic and constitutional integrity to the degree seen in the 1860s.

3. The Closest Parallel: The Gilded Age (1870s–1890s)

If you want a historical mirror to modern America, the Gilded Age is the closest match.

According to congressional voting records (measured by political scientists using DW-NOMINATE scores), the U.S. Congress today is as polarized as it was during the late Reconstruction and Gilded Age eras. The similarities between the two eras are striking:

Just like today, Gilded Age politics were fiercely tribal, and the media of the time (often called "yellow journalism") was highly partisan and sensationalized.

Why Today's Polarization Feels Unique (and Dangerous)

While we have been here before, there are several structural factors that make today's polarization uniquely challenging and, in some ways, harder to resolve than in the past:

Complete "Sorting"

In the past, a person’s political party did not perfectly predict their worldview. You could easily find conservative Democrats or liberal Republicans. Today, the "sorting" of the American electorate is virtually complete. Geography, race, religion, education, and cultural preferences now align almost perfectly with political party. When political identity merges with personal identity, compromise starts to feel like a betrayal of who you are.

Exploding Affective Polarization (The "Dislike" Factor)

What is truly unprecedented about the current era is how much partisans actively dislike each other.

Asymmetry and Shifts in the Electorate

Scholars note that polarization has not happened entirely symmetrically. On the legislative level, congressional polarization has primarily been driven by a sharp rightward shift among Republicans.

However, on the public level, a 2026 study by the University of Cambridge’s Political Psychology Lab found that public issue polarization has increased by 64% since 1988, with almost all of that rise occurring after 2008. Interestingly, the study found this shift was heavily driven by the American left becoming significantly more socially liberal over the last few decades, while the average right-leaning American's social positions remained relatively stable.

The Digital Megaphone

While the Gilded Age had partisan newspapers, today's information ecosystem is powered by algorithms designed to maximize engagement through outrage. Social media, partisan cable news, and digital echo chambers allow Americans to live in entirely different informational realities, making a shared factual consensus nearly impossible to achieve.

Conclusion

Is polarization worse than ever? No. The country is not on the brink of a literal regional war like it was in 1861.

Is it worse than it has been in modern history? Yes. We are living through a level of partisan sorting, mutual hostility, and institutional gridlock that has not been seen in well over a century. What makes today's division particularly alarming is that, unlike the Gilded Age, our modern media and technology are engineered to deepen these divides rather than bridge them.