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

To answer whether political polarization is worse than in the past, it helps to look at history in two ways: compared to living memory (the mid-to-late 20th century) and compared to the entirety of American history.

By almost every modern metric, political polarization in the United States is worse than it has been in over a century. However, if we look back to the mid-19th century—specifically the era surrounding the American Civil War—today's divisions, while severe, are not entirely unprecedented.

To understand how today’s polarization compares to the past, political scientists separate the issue into two categories: ideological polarization (disagreement on policy) and affective polarization (dislike of the other side).

1. Ideological Polarization: Congress is at its Most Divided Since Reconstruction

Political scientists use a metric called DW-NOMINATE to track the ideological positions of members of Congress based on their roll-call votes.

2. Affective Polarization: Out-Group Animus is at Historic Highs

While people can disagree on policy and still respect one another, affective polarization measures how much partisans actually dislike and distrust members of the opposing party. This is where modern polarization is particularly severe.

3. Why Modern Polarization Feels Different (and Dangerous)

While the late 19th century had high levels of legislative gridlock, several unique features make today’s polarization feel uniquely volatile:

Partisan "Sorting" (The Mega-Identity)

In the past, a person’s political party did not automatically tell you their religion, race, geography, or cultural preferences. You could easily find a conservative, rural, church-going Democrat, or a liberal, urban, secular Republican.
Today, these identities have "sorted". Nearly all conservative, rural, religious, and white working-class voters have aligned with the Republican Party, while liberal, urban, secular, and racially diverse voters have aligned with the Democratic Party. Because party identity now overlaps with cultural, racial, and religious identities, political disagreements feel like existential battles over lifestyle and values.

The Media Environment and Technology

In the 19th century, newspapers were openly partisan, but their reach was localized. In the mid-20th century, Americans relied on a few centralized, highly regulated broadcast networks that aimed for broad appeal. Today, the 24-hour cable news cycle, highly partisan online media, and social media algorithms are designed to maximize user engagement. Because outrage drives engagement, these platforms routinely amplify the most extreme voices, distorting how each side perceives the other.

Nationalization of Local Politics

Historically, voters chose local representatives based on local issues. Today, local and state elections have become heavily "nationalized." A school board race or a mayoral election is often fought over national cultural battlegrounds, meaning there are fewer and fewer spaces where Americans can escape national partisan warfare.

4. Is This Happening Everywhere?

It is tempting to think this is a universal symptom of the internet age, but research suggests the U.S. is an outlier. A landmark study by researchers at Brown and Stanford universities tracked affective polarization across nine major democracies over four decades. While polarization did rise in some countries (like Canada and Switzerland), it actually decreased in others (like the UK, Germany, and Sweden). The study concluded that the United States has polarized faster and more intensely than any other comparable advanced democracy.

Conclusion

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

While we are not at the brink of a 19th-century-style civil war, the modern combination of cultural sorting, media fragmentation, and deep institutional distrust has created a brand of polarization that is uniquely difficult to dismantle.