Is political polarization worse than it's been in the past?
Yes, by multiple measurable standards, political polarization in the United States is worse now than it has been for most of the past century, particularly since the mid-20th century, though it is not unprecedented in American history and differs in character from earlier peaks like the Civil War era.[1][2]
Polarization has two main forms: ideological/issue polarization (disagreement on policies and values) and affective polarization (emotional dislike or distrust of the other side). Both elite (politicians/Congress) and mass (public) levels show clear increases in recent decades.
Elite/Congressional Polarization
DW-NOMINATE scores (which scale lawmakers’ roll-call votes on a liberal-conservative dimension, comparable over time) show Democrats and Republicans farther apart ideologically than at any point in the past 50 years. Overlap between the parties has essentially vanished: since the early 2000s, there has been virtually no ideological common ground in the House or Senate (e.g., the least liberal Democrat is more liberal than the least conservative Republican).[2][2]
Historically, congressional polarization was high in the late 19th and early 20th centuries (post-Reconstruction/Gilded Age), declined through the mid-20th century (partly due to conservative Southern Democrats creating more bipartisanship, often on racial issues), and has risen sharply since the 1970s—reaching post-Reconstruction highs and levels often described as the worst since the Civil War/Reconstruction era.[4][5][6] The mid-20th-century “consensus” era was less polarized partly because major parties did not fully challenge segregation.
Public/Mass Polarization
Historical Context and Caveats
America has always had deep divisions—Federalists vs. Democratic-Republicans, slavery and sectionalism leading to the Civil War, the 1960s (Vietnam, civil rights, cultural upheaval), etc. There was no prolonged golden age of unity.[13] The Civil War involved actual secession, mass combat, and hundreds of thousands of deaths over fundamental questions of slavery and union; today’s divides, while intense (with rising political violence, distrust of institutions/elections, and “pernicious” levels rare among wealthy democracies), have not reached that scale of organized conflict.[1][14]
Differences today include:
Polarization contributes to gridlock, declining trust, difficulty addressing issues like debt, and risks to democratic norms, but it is not inevitable or irreversible, and public views are often less extreme or tribal than elite/media portrayals suggest.[15][16] Measures vary by definition (elites vs. masses; issues vs. feelings), and some recent data show stabilization.
In short, relative to the post-WWII era and much of the late 20th century, yes—polarization is substantially worse on both elite and mass metrics. Relative to the full sweep of U.S. history, it ranks among the higher periods but is distinct from the Civil War catastrophe. Data from sources like Voteview/DW-NOMINATE, Pew Research, ANES, and academic clustering studies consistently support the recent surge.
Citations (16)
- https://www.theatlantic.com/ideas/archive/2022/05/us-democrat-republican-partisan-polarization/629925/
Backs: “Yes, by multiple measurable standards, political polarization in the United States is worse now than it has been for most of the past century, particularly since the mid-20th century, though it is not unprecedented in American history and differs in character from earlier peaks like the Civil War era.”
evidence, article, points to yes. Claim: Polarization is worse than most of the past century but not unprecedented; affective polarization has grown, with out-party feelings cooling and the U.S. standing out among democracies.
- https://www.pewresearch.org/short-reads/2022/03/10/the-polarization-in-todays-congress-has-roots-that-go-back-decades/
Backs: “Yes, by multiple measurable standards, political polarization in the United States is worse now than it has been for most of the past century, particularly since the mid-20th century, though it is not unprecedented in American history and differs in character from earlier peaks like the Civil War era.”
evidence, article, points to yes. Claim: DW-NOMINATE shows Democrats and Republicans farther apart than in 50 years, with virtually no ideological overlap in Congress since the early 2000s.
- https://pewresearch.org/short-reads/2022/03/10/the-polarization-in-todays-congress-has-roots-that-go-back-decades/
Backs: “Southern conservatives moved from Democrats to Republicans; the Democratic caucus became more diverse and urban/liberal.”
evidence, article, points to yes. Claim: Geographic and demographic realignment, including Southern conservatives moving to the GOP, contributed to congressional polarization.
- https://www.amacad.org/publication/daedalus/party-polarization-congress
Backs: “Historically, congressional polarization was high in the late 19th and early 20th centuries (post-Reconstruction/Gilded Age), declined through the mid-20th century (partly due to conservative Southern Democrats creating more bipartisanship, often on racial issues), and has risen sharply since the 1970s—reaching…”
evidence, official document, points to yes. Claim: Congressional polarization was high in the Gilded Age, fell mid-century, and has risen sharply since the 1970s.
- https://voteviewblog.com/2015/07/11/an-update-on-house-and-senate-polarization/
Backs: “Historically, congressional polarization was high in the late 19th and early 20th centuries (post-Reconstruction/Gilded Age), declined through the mid-20th century (partly due to conservative Southern Democrats creating more bipartisanship, often on racial issues), and has risen sharply since the 1970s—reaching…”
evidence, article, points to yes. Claim: House and Senate polarization has reached post-Reconstruction highs.
- https://today.usc.edu/political-polarization-at-its-worst-since-the-civil-war-2/
Backs: “Historically, congressional polarization was high in the late 19th and early 20th centuries (post-Reconstruction/Gilded Age), declined through the mid-20th century (partly due to conservative Southern Democrats creating more bipartisanship, often on racial issues), and has risen sharply since the 1970s—reaching…”
evidence, article, points to yes. Claim: Polarization is described as the worst since the Civil War/Reconstruction era.
- https://phys.org/news/2026-02-political-division-surged-onward.html
Backs: “The U.S. is an outlier globally for its evenly sized left/right clusters.”
statistic, article, points to yes. Claim: A 2026 Cambridge study found issue divisions rose about 64% since 1988, mostly after 2008.
- https://www.zmescience.com/science/news-science/us-political-polarization-exploded-since-2008-largely-due-to-a-shift-on-the-left/
Backs: “The U.S. is an outlier globally for its evenly sized left/right clusters.”
statistic, article, points to yes. Claim: U.S. polarization rose sharply since 2008, largely from a leftward shift on social issues.
- https://www.cam.ac.uk/stories/political-division-united-states
Backs: “The U.S. is an outlier globally for its evenly sized left/right clusters.”
statistic, article, points to yes. Claim: Cambridge study details: left cluster ~31.5% more socially liberal, right ~2.8% more conservative, equal-sized clusters, U.S. an outlier.
- https://goodauthority.org/news/americans-views-of-the-opposite-party-have-declined-even-further/
Backs: “The U.S. has seen one of the largest increases among advanced democracies.”
evidence, article, points to yes. Claim: Americans' views of the opposite party have declined further, supporting growth in affective polarization.
- https://siepr.stanford.edu/publications/working-paper/cross-country-trends-affective-polarization
Backs: “The U.S. has seen one of the largest increases among advanced democracies.”
evidence, official document, points to yes. Claim: The U.S. has seen one of the largest increases in affective polarization among advanced democracies.
- https://www.pewresearch.org/politics/2017/10/05/the-partisan-divide-on-political-values-grows-even-wider/
Backs: “Pew data show average partisan gaps on core values (government aid, race, immigration, etc.) roughly doubled from ~15 points in 1994 to ~36 points by the mid-2010s, dwarfing other divides.”
statistic, article, points to yes. Claim: Pew: average partisan gaps on core values roughly doubled from ~15 points in 1994 to ~36 by the mid-2010s.
- https://archive.is/2026.07.05-104443/https://edition.cnn.com/2026/07/05/politics/trump-july-4-america-250-civil-war-analysis
Backs: “Democratic-Republicans, slavery and sectionalism leading to the Civil War, the 1960s (Vietnam, civil rights, cultural upheaval), etc. There was no prolonged golden age of unity.”
evidence, article, neutral. Claim: America has always had deep divisions; there was no prolonged golden age of unity.
- https://www.cnn.com/2026/07/05/politics/trump-july-4-america-250-civil-war-analysis
Backs: “There was no prolonged golden age of unity.The Civil War involved actual secession, mass combat, and hundreds of thousands of deaths over fundamental questions of slavery and union; today’s divides, while intense (with rising political violence, distrust of institutions/elections, and “pernicious” levels rare among…”
evidence, article, points to no. Claim: Today's divides have not reached the scale of Civil War organized conflict despite rising political violence and distrust.
- https://fortune.com/2025/11/13/38-trillion-national-debt-political-polarization-barry-eichengreen/
Backs: “Polarization contributes to gridlock, declining trust, difficulty addressing issues like debt, and risks to democratic norms, but it is not inevitable or irreversible, and public views are often less extreme or tribal than elite/media portrayals suggest.”
background, article, neutral. Claim: Polarization contributes to gridlock and difficulty addressing issues like the national debt.
- https://news.umich.edu/beyond-the-great-divide-what-we-really-know-about-political-polarization/
Backs: “Polarization contributes to gridlock, declining trust, difficulty addressing issues like debt, and risks to democratic norms, but it is not inevitable or irreversible, and public views are often less extreme or tribal than elite/media portrayals suggest.”
evidence, article, points to no. Claim: Public views are often less extreme or tribal than elite and media portrayals suggest.