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

The short answer is: It depends on which "past" you are comparing it to.

If you compare today’s political environment to the mid-to-late 20th century (the post-WWII era), yes, political polarization is significantly worse and has reached levels not seen in living memory. However, if you look at longer-term American history—specifically the Civil War era of the 1850s and 1860s, or the Reconstruction and Gilded Age periods of the late 19th century—current polarization is comparable on some metrics, though it has not (yet) resulted in the same level of political violence or national fracture.

To understand how today’s polarization compares to the past, political scientists and historians look at two different types of division: ideological polarization (how far apart the parties are on policy issues) and affective polarization (how much partisans dislike and distrust the other side).

1. The Civil War (The Ultimate Benchmark)

The era surrounding the American Civil War (roughly 1850–1865) remains the absolute peak of polarization in U.S. history.

•The Division: The country was geographically and economically split over the existential, moral issue of slavery. Because slavery was viewed through an intense moral lens, compromise became mathematically and politically impossible.

•The Result: Unlike today's gridlock, the polarization of the 1860s broke the political system entirely, leading to the armed secession of the Southern states and a war that claimed hundreds of thousands of lives. By this standard, today’s polarization—while severe—is not yet as destructive.

2. The Gilded Age & Reconstruction (Late 19th Century)

In terms of how members of Congress vote, the late 1870s through the 1890s closely mirror today.

•The Division: Using "DW-NOMINATE" scores (which track how often politicians vote along party lines), political scientists have found that congressional polarization in the late 19th century was just as high as it is today.

•The Difference: Historians note a key difference in why they were polarized. In the Gilded Age, the intense party loyalty was driven less by deep ideological disagreements on major national policies and more by patronage, the "spoils system," and regional identities left over from the Civil War. Parties fought fiercely over government jobs and resources, whereas today's divisions are deeply ideological, covering social issues, the role of government, and national identity.

3. The Mid-20th Century (The "Bipartisan Anomaly")

When people nostalgic for the past talk about "the way politics used to be," they are usually thinking of the 1950s through the 1970s. However, political scientists view this era as a historical anomaly.

•The Division: During this era, the two major parties were highly heterogeneous. The Democratic Party contained both liberal northern reformers and deeply conservative southern segregationists. The Republican Party had both conservative midwesterners and liberal northeasterners ("Rockefeller Republicans").

•The Result: Because there was so much ideological overlap between the parties, bipartisan coalitions were common. However, this "golden era of cooperation" was built on a fragile foundation, largely sustained by a shared focus on the Cold War and a domestic political consensus that chose to ignore or suppress civil rights issues for decades.

What Makes Today’s Polarization Unique (and Arguably Worse)?

While today’s polarization may not be as geographically clean-cut as the Civil War, many scholars argue that the nature of modern polarization makes it uniquely difficult to resolve:

1.The "Sorting" of the Parties: In the past, you could be a liberal Republican or a conservative Democrat. Since the civil rights movement of the 1960s, the parties have completely "sorted." Today, almost all liberals are Democrats, and almost all conservatives are Republicans. There is virtually zero ideological overlap left in Congress.

2.High Affective Polarization: This is where today’s era is particularly dangerous. People do not just disagree on tax rates; they actively dislike and fear the other side. Research from the Pew Research Center highlights a massive spike in partisan hostility. In 2022, 72% of Republicans and 63% of Democrats viewed members of the opposing party as "more immoral" than other Americans—up from 47% and 35% in 2016.

3.The Conflation of Identity: Today, political affiliation is no longer just about policy preferences; it is deeply tied to a person's cultural, religious, racial, geographic, and lifestyle identity. When politics becomes an identity, compromise feels like a betrayal of who you are.

4.Partisan and Social Media: Unlike the Gilded Age or the 1960s, modern algorithms on social media platforms are designed to maximize engagement, which often means promoting content that triggers outrage and fear of the "out-group." This creates "echo chambers" that make the other side seem far more extreme than they actually are.

5.An International Outlier: While polarization is rising globally, studies (such as research from Brown University) show that the United States is polarizing much faster than other major democracies like Canada, the UK, Germany, or Australia.

Summary

If "the past" means the mid-20th century, yes, polarization is much worse today. If "the past" includes the 1860s, no, we have not reached the absolute worst point in American history. However, the combination of modern technology, total ideological party sorting, and deep cultural hostility has created a brand of polarization that is historically unique and highly resilient to traditional political solutions.

Citations (12)

1usc.eduAcademic
usc.edu
Backs: “If you compare today’s political environment to the mid-to-late 20th century (the post-WWII era), yes, political polarization is significantly worse and has reached levels not seen in living memory. However,”
2democracyproject.orgNonprofits and think tanks
democracyproject.org
Backs: “However, if you look at longer-term American history—specifically the Civil War era of the 1850s and 1860s, or the Reconstruction and Gilded Age periods of the late 19th century—current polarization is comparable on some metrics, though it has not (yet) resulted in the same level of political violence or national…”
3wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “To understand how today’s polarization compares to the past, political scientists and historians look at two different types of division: ideological polarization (how far apart the parties are on policy issues) and affective polarization (how much partisans dislike and distrust the other side).”
4brookings.eduNonprofits and think tanks
brookings.edu
Backs: “The Civil War (The Ultimate Benchmark). The era surrounding the American Civil War (roughly 1850–1865) remains the absolute peak of polarization in U.S. history. The Division: The country was geographically and economically split over the existential, moral issue of slavery.”
5cambridge.orgAcademic
cambridge.org
Backs: “The Difference: Historians note a key difference in why they were polarized. In the Gilded Age, the intense party loyalty was driven less by deep ideological disagreements on major national policies and more by patronage, the "spoils system," and regional identities left over from the Civil War.”
6facinghistory.orgNonprofits and think tanks
facinghistory.org
Backs: “The Division: During this era, the two major parties were highly heterogeneous. The Democratic Party contained both liberal northern reformers and deeply conservative southern segregationists.”
7uchicago.eduAcademic
uchicago.edu
Backs: “However, this "golden era of cooperation" was built on a fragile foundation, largely sustained by a shared focus on the Cold War and a domestic political consensus that chose to ignore or suppress civil rights issues for decades. ---. What Makes Today’s Polarization Unique (and Arguably Worse)?”
8brown.eduAcademic
brown.edu
Backs: “Since the civil rights movement of the 1960s, the parties have completely "sorted." Today, almost all liberals are Democrats, and almost all conservatives are Republicans.”
9cam.ac.ukAcademic
cam.ac.uk
Backs: “Since the civil rights movement of the 1960s, the parties have completely "sorted." Today, almost all liberals are Democrats, and almost all conservatives are Republicans.”
10gallup.comCompanies
gallup.com
Backs: “Since the civil rights movement of the 1960s, the parties have completely "sorted." Today, almost all liberals are Democrats, and almost all conservatives are Republicans. There is virtually zero ideological overlap left in Congress.”
11usc.eduAcademic
usc.edu
Backs: “There is virtually zero ideological overlap left in Congress. High Affective Polarization: This is where today’s era is particularly dangerous.”
12syr.eduAcademic
syr.edu
Backs: “Research from the Pew Research Center highlights a massive spike in partisan hostility. In 2022, 72% of Republicans and 63% of Democrats viewed members of the opposing party as "more immoral" than other Americans—up from 47% and 35% in 2016.”