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

Both sidesSays it is contested

Whether political polarization is "worse than it has been in the past" depends entirely on which era of history you compare it to, and how you measure it.

To understand where we stand today, political scientists usually look at polarization through two lenses: ideological polarization (how far apart political elites are on policy issues) and affective polarization (how much everyday citizens dislike and distrust those on the other side).

Here is how today’s divisions compare to the past.

1. Yes, it is worse (compared to the last 50–70 years)

If your baseline of comparison is the mid-to-late 20th century, the United States is indeed more polarized today than at any point in living memory.

•The Death of the Political Moderate: According to DW-NOMINATE (a statistical system used by political scientists to measure congressional voting records), members of Congress are more ideologically divided today than at any time since the Reconstruction Era in the late 1870s. In the 1970s, there were over 160 moderate members of Congress who frequently voted across party lines. Today, moderate crossovers have virtually vanished; voting has collapsed into a strict, highly predictable party-line block.

•Extreme "Affective" Polarization: It is not just that we disagree on policy; we have grown to actively dislike each other. In 2000, only about 8% of partisans gave the opposing party a "zero" (completely cold/unfavorable) on the American National Election Studies "feeling thermometer." By 2020, that number had skyrocketed to 40%.

•The "Mega-Identity": In the mid-20th century, social identities overlapped. You could be a conservative Southern Democrat, a liberal Northeast Republican, or belong to a union or church that crossed party lines. Today, our identities have "sorted." Political party alignment now heavily correlates with geography (urban vs. rural), religion, race, and educational attainment. When political identity merges with cultural, religious, and geographic identity, compromise feels like a betrayal of who you are.

2. No, it is not the worst (compared to the deep past)

When looking at the entirety of American history, we have survived eras of polarization that were far more violent and structurally destructive than today.

•The Civil War Era (1861–1865): This remains the absolute peak of American polarization. The country literally split in half over the moral and economic institution of slavery, culminating in an armed conflict that claimed the lives of roughly 620,000 Americans.

•The Reconstruction Era (Late 1860s–1870s): Political violence was a daily reality in the American South. The rise of the Ku Klux Klan, widespread voter suppression, and the highly contested presidential election of 1876 (which required a massive backroom political compromise to avoid a second civil war) represented structural instability far beyond what we experience today.

•The Founding Era (1790s–1800s): The early decades of the republic were incredibly bitter. The Federalists and Democratic-Republicans weaponized highly partisan newspapers to accuse each other of treason. In 1798, the Federalist administration passed the Alien and Sedition Acts, which they used to jail rival journalists and politicians who criticized the government.

•The late 1960s and early 1970s: While congressional voting patterns were less polarized than they are now, the social fabric of the country was arguably more fractured. The era was defined by the Vietnam War, civil rights struggles, high-profile assassinations (Martin Luther King Jr., Robert F. Kennedy), mass protests, draft-card burnings, and widespread urban riots.

What makes today's polarization uniquely challenging?

Even if we are not on the brink of a military civil war, modern polarization features a few dangerous elements that have no historical precedent:

1.The Modern Media Ecosystem: In the past, citizens generally consumed the same centralized news (e.g., the three major television networks). Today, highly fragmented cable news, social media algorithms, and online echo chambers allow people to live in entirely different informational universes, disagreeing not just on opinions, but on basic, verifiable facts.

2.Asymmetric Polarization: Political scientists note that while both parties have drifted from the center, the shift has been unequal. Data shows that the Republican Party has shifted significantly further to the right over the last few decades than the Democratic Party has shifted to the left, which has fundamentally altered the dynamics of federal governance.

3.Institutional Gridlock: Because the U.S. Constitution was designed with numerous "checks and balances," it requires a high degree of consensus to function. In a highly polarized environment, these checks and balances often transform into tools of total obstruction, leading to frequent government shutdowns, debt limit crises, and an inability to pass routine legislation.

Conclusion

Is polarization worse than it has been in the past? Yes, if you compare today to the post-WWII era of consensus. The level of mutual animosity and the lack of overlapping social identities between Democrats and Republicans are at historic highs.

However, no, if you compare it to the existential crises of the 19th century. The U.S. is not currently fighting a shooting war against itself, nor are political factions regularly engaging in physical warfare in the streets or on the floor of Congress. But the modern gridlock and "us vs. them" tribalism present a slow-burning crisis that continues to test the resilience of democratic institutions.

Citations (6)

1wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “To understand where we stand today, political scientists usually look at polarization through two lenses: ideological polarization (how far apart political elites are on policy issues) and affective polarization (how much everyday citizens dislike and distrust those on the other side).”
background, reference entry, neutral. Claim: Political scientists look at polarization through ideological polarization (elite policy distance) and affective polarization lenses.
2pewresearch.orgNonprofits and think tanks
pewresearch.org
Backs: “The Death of the Political Moderate: According to DW-NOMINATE (a statistical system used by political scientists to measure congressional voting records), members of Congress are more ideologically divided today than at any time since the Reconstruction Era in the late 1870s. In the 1970s, there were over 160 moderate…”
evidence, article, points to yes. Claim: Per DW-NOMINATE, Congress is more ideologically divided than at any time since Reconstruction.
3usc.eduAcademic
usc.edu
Backs: “The Death of the Political Moderate: According to DW-NOMINATE (a statistical system used by political scientists to measure congressional voting records), members of Congress are more ideologically divided today than at any time since the Reconstruction Era in the late 1870s. In the 1970s, there were over 160 moderate…”
evidence, article, points to yes. Claim: Per DW-NOMINATE, Congress is more ideologically divided than at any time since Reconstruction; moderates have vanished.
4listenfirstproject.orgNonprofits and think tanks
listenfirstproject.org
Backs: “In 2000, only about 8% of partisans gave the opposing party a "zero" (completely cold/unfavorable) on the American National Election Studies "feeling thermometer." By 2020, that number had skyrocketed to 40%.”
statistic, article, points to yes. Claim: Share of partisans giving the opposing party a zero on the feeling thermometer rose from about 8% in 2000 to 40% by 2020.
5ebsco.comCompanies
ebsco.com
Backs: “Today, our identities have "sorted." Political party alignment now heavily correlates with geography (urban vs.”
evidence, reference entry, points to yes. Claim: Identities have sorted so party aligns with geography, religion, race and education, intensifying polarization.
6carnegie.orgNonprofits and think tanks
carnegie.org
Backs: “them" tribalism present a slow-burning crisis that continues to test the resilience of democratic institutions. 1.”
background, article, neutral. Claim: Modern gridlock and us-vs-them tribalism present a slow-burning crisis testing democratic institutions.