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

Whether political polarization is "worse than it’s ever been" depends on how far back in history you look.

If we compare today's political climate to the mid-to-late 20th century, polarization is at a historic peak. However, if we look across the entirety of American history, we are not yet at the absolute lowest point of division, which occurred during the Civil War era.

An analysis of how today’s divisions compare to the past, and what makes current polarization unique, reveals several key dynamics.

1. The Modern Comparison: Yes, It is Worse Than in Recent Decades

Compared to the period between the 1940s and the 1980s—often referred to by political scientists as the "Era of Consensus"—the United States is vastly more polarized today.

•The Disappearance of Moderates (Ideological Sorting): In the mid-20th century, both political parties were big tents. There were conservative Southern Democrats and liberal Northeastern Republicans, which forced lawmakers to build cross-party coalitions. Today, the parties have "sorted." Virtually all Democrats are to the left of virtually all Republicans, and ideological moderates in Congress have essentially vanished.

•Congressional Gridlock: Political scientists Keith Poole and Howard Rosenthal developed "NOMINATE" scores to track legislative voting records. Their data shows that Congress is more ideologically divided today than at any point since the Reconstruction Era (the late 1870s).

•The Rise of "Affective Polarization": Perhaps the most alarming change is not just that people disagree on policy, but that they actively dislike one another. This is known as affective polarization—when voters view the opposing party not just as wrong, but as a threat to the nation.

•In the 1970s, voters generally felt neutral toward the opposing party. By the 2020s, Pew Research found that 72% of Republicans and 63% of Democrats viewed members of the opposing party as "more immoral" than average Americans.

•The U.S. is an Outlier: A landmark study by Brown University found that while polarization has risen in some other countries, the United States has polarized significantly faster and deeper over the last 40 years than other major Western democracies, including Canada, the UK, Germany, and Australia.

2. The Deep Historical Comparison: It Has Been Worse Before

When taking the long view of American history, today's polarization—while severe—does not yet match the existential crises of the country's past.

•The Civil War Era (1850s–1860s): This remains the absolute peak of American polarization. The country was divided geographically, economically, and morally over slavery. The divide was so severe that it resulted in the physical caning of Senator Charles Sumner on the Senate floor, the secession of 11 states, and a civil war that claimed hundreds of thousands of American lives.

•The Founding Era (1790s): The decade after the ratification of the Constitution was incredibly vitriolic. The Federalists (led by Alexander Hamilton and John Adams) and the Democratic-Republicans (led by Thomas Jefferson and James Madison) viewed each other as traitors. The Federalists passed the Alien and Sedition Acts to jail political opponents and journalists, and political rivals regularly engaged in fatal duels (most famously, Aaron Burr killing Alexander Hamilton).

•The Gilded Age (1870s–1890s): This era featured extreme partisan gridlock, highly regionalized voting patterns, and massive wealth inequality. Politics was fierce, corrupt, and highly tribal, with voter turnout reaching historic highs because parties functioned as central social identities.

•The 1960s: While the political parties themselves were not as cleanly sorted as they are today, the societal polarization of the 1960s was highly violent. The decade was marked by the assassinations of Martin Luther King Jr., Robert F. Kennedy, and John F. Kennedy; massive riots in major cities; and violent clashes over the Vietnam War and civil rights.

3. What Makes Today’s Polarization Unique?

While we are not in a civil war, today's polarization is fueled by modern mechanisms that make it feel uniquely intractable:

•The "Mega-Identity": In the past, a person’s political party was just one of many identities. A voter might have been a conservative, a union member, a churchgoer, and a Democrat all at once. Today, social identities have aligned. Race, religion, geography (urban vs. rural), and cultural preferences have fused with political affiliation. When political disagreements happen today, they feel like attacks on a person's entire lifestyle and worldview.

•The Digital Information Ecosystem: Partisan cable news, social media algorithms, and online echo chambers did not exist in the 19th or 20th centuries. Algorithms are designed to maximize engagement, which often means promoting content that triggers outrage and fear of the "other side." This has created a massive perceived polarization gap, where voters believe the average member of the opposing party is far more extreme than they actually are.

•Nationalized Local Politics: In the past, local issues dominated local elections, allowing for regional variations in parties. Today, politics has been almost entirely nationalized. School board meetings, mayoral races, and state legislative elections are now fought over the same highly polarized national cultural issues.

Conclusion

Is political polarization worse than it has been in the past? Yes, if your point of comparison is the living memory of most Americans. The country has not experienced this level of partisan animosity, congressional gridlock, and social sorting in over a century.

However, no, if you look at the darkest chapters of American history. The U.S. has survived periods of deeper institutional collapse, physical violence among leaders, and actual civil war. The challenge of the modern era is whether the country can navigate its current high-tech, identity-driven divisions without slipping back into those historical extremes.

Citations (6)

1usc.eduAcademic
usc.edu
Backs: “Whether political polarization is "worse than it’s ever been" depends on how far back in history you look.”
2nih.govGovernment
nih.gov
Backs: “If we compare today's political climate to the mid-to-late 20th century, polarization is at a historic peak. However, if we look across the entirety of American history, we are not yet at the absolute lowest point of division, which occurred during the Civil War era.”
3syr.eduAcademic
syr.edu
Backs: “However, if we look across the entirety of American history, we are not yet at the absolute lowest point of division, which occurred during the Civil War era.”
4facinghistory.orgNonprofits and think tanks
facinghistory.org
Backs: “The Disappearance of Moderates (Ideological Sorting): In the mid-20th century, both political parties were big tents. There were conservative Southern Democrats and liberal Northeastern Republicans, which forced lawmakers to build cross-party coalitions.”
5brown.eduAcademic
brown.edu
Backs: “Today, the parties have "sorted." Virtually all Democrats are to the left of virtually all Republicans, and ideological moderates in Congress have essentially vanished.”
6wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “This is known as affective polarization—when voters view the opposing party not just as wrong, but as a threat to the nation. In the 1970s, voters generally felt neutral toward the opposing party.”