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Grok 4.5Sep 19, 2026x-ai/grok-4.5-20260708

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

I'll look into historical data, surveys, and expert analyses on political polarization to compare current levels with the past.Gathering more details from key sources on polarization trends.[1][2][3][4]Yes, by most standard modern metrics, political polarization in the United States (the primary focus of available data) is worse than it has been in recent decades—particularly since the late 20th century—and stands out as unusually high among peer democracies, though it is not entirely unprecedented in longer American history.[1]

Polarization has multiple dimensions: ideological/issue (gaps in policy views), affective (emotional dislike or hostility toward the other side), elite/partisan (in Congress and parties), and social (effects on relationships and interactions). Data consistently show increases across these, especially since the 1990s–2000s, with a notable acceleration after 2008 in some measures.

Recent Trends (Last 30–50 Years)

•Issue/ideological polarization: A 2026 University of Cambridge study using American National Election Studies (ANES) data and clustering algorithms found that divisions on social and political issues (e.g., abortion, equality, traditional values, race, health insurance) rose 64% from 1988 to 2024. Nearly all the increase occurred after 2008 (around the financial crisis, Obama’s election, and the rise of smartphones/social media), with a possible slight leveling after 2020. It was driven mainly by the left/liberal cluster becoming 31.5% more socially liberal, while the right became only about 2.8% more conservative. Clusters remained roughly equal in size (unusual globally), with more “sorting” (people aligning consistently with party/ideology labels).[1][5]
•Congress and elites: Pew Research analysis of DW-NOMINATE scores shows Democrats and Republicans in Congress are farther apart ideologically than at any point in the past 50 years. Overlap has vanished (none in the House since ~2002; Senate shortly after). Both parties grew more cohesive (far fewer moderates), with Democrats shifting modestly left and Republicans more substantially right. Geographic/demographic sorting (e.g., Southern shift to Republicans) reinforced this.[2][2]
•Affective polarization and hostility: Views of the opposing party have grown far more negative. Pew data show large majorities now view the other side as more immoral, dishonest, or closed-minded than in the past (e.g., jumps from the 2010s). Feeling thermometer ratings of the out-party dropped from near-neutral (~48 in the late 1970s) to much colder levels (around 26 by 2024 in some data). Unfavorable views of both parties have also risen. Partisan gaps on issues like guns, climate, and abortion have widened substantially since the 1990s/2000s.[3][6]
•V-Dem and broader measures: Varieties of Democracy (V-Dem) data show U.S. “political polarization” (hostile camps undermining social relationships) rising sharply since ~1990/2005, reaching “pernicious” levels (high hostility) around 2015 and remaining elevated. The U.S. is an outlier among wealthy Western democracies—few peers (e.g., brief spikes in France 1968 or Italy 1970s) reached similar sustained levels. Globally, polarization has risen in most regions since ~2005, but less extremely than in the U.S. in many cases.[4][7]

Pew and other surveys also document growing demographic alignment with parties (race, education, geography, religion) and frustration with the two-party system, alongside perceptions that polarization harms the nation (e.g., high among local officials).

Longer Historical Context

Polarization is not new to the U.S., and the relatively low-polarization mid-20th century (roughly New Deal through the 1970s/early 1980s, with more cross-cutting cleavages and party overlap) was somewhat anomalous.[8]

•Civil War era (1850s–1860s): Far more extreme, with sectional (North-South) polarization over slavery leading to secession, war, and ~600,000–700,000+ deaths. Parties fractured; violence and breakdown of norms were widespread. Today’s divisions are intense and party-aligned but have not produced equivalent institutional collapse or mass violence (though political violence and threats have risen). Some scholars see similarities in demonization and media fragmentation, but the stakes and outcomes differ.[9]
•Earlier periods (e.g., Adams/Jefferson era, late 19th century Gilded Age, 1960s): Intense friction, cultural upheaval, assassinations, riots, and Vietnam-era divisions occurred. Some historians argue today’s divides are not deeper than the 1960s or early republic in substantive terms, though they are more cleanly sorted along party lines and affect more of daily life via media. Others call current polarization the most dangerous since the Civil War precisely because of its partisan, nationalized, and affective character.[10][11]

Local communities often show more resilience than national politics suggests. The public is not fully “tribal”—opinions remain somewhat fuzzy, with many holding mixed views—though elite cues, media, and sorting amplify divides. The U.S. is distinctive in having roughly equal-sized left and right clusters, heightening the sense of stalemate.[1]

Global Picture and Caveats

Polarization has risen in many democracies (linked partly to social media, economic/cultural shifts, and elite behavior), but the U.S. is often an extreme case among established ones. Cross-national studies of affective polarization find the U.S. with one of the largest increases over recent decades.[12]

Caveats: Metrics vary (self-ID vs. issues vs. affect); mass publics are often less extreme than elites or media portrayals; some recent data hint at stabilization; and “worse” depends on the baseline (recent decades vs. all of history). Causes include party sorting, media fragmentation, cultural/economic changes, and mutual reinforcement of elite and mass dynamics—not a single factor.

In short, for the period with the best comparable data (post-WWII or post-1980s), yes—polarization is measurably higher and more pernicious in key ways than in the recent past, contributing to gridlock, distrust, and social strain. It echoes (but does not fully match) America’s most divided historical eras. Trends can reverse with institutional, cultural, or leadership shifts, as they have in other contexts.

Citations (12)

  1. 1cam.ac.ukAcademic
    https://www.cam.ac.uk/stories/political-division-united-states

    Backs: “I'll look into historical data, surveys, and expert analyses on political”

  2. 2pewresearch.orgNonprofits and think tanks
    https://www.pewresearch.org/short-reads/2022/03/10/the-polarization-in-todays-congress-has-roots-that-go-back-decades/

    Backs: “I'll look into historical data, surveys, and expert analyses on political polarization to compare current levels with the past.Gathering more details from key sources on polarization trends.Yes,”

  3. 3pewresearch.orgNonprofits and think tanks
    https://www.pewresearch.org/politics/2017/10/05/1-partisan-divides-over-political-values-widen/

    Backs: “I'll look into historical data, surveys, and expert analyses on political polarization to compare current levels with the past.Gathering more details from key sources on polarization trends.[[1]”

  4. 4carnegieendowment.orgNonprofits and think tanks
    https://carnegieendowment.org/files/McCoy_et_al_-_Polarization_final_3.pdf

    Backs: “I'll look into historical data, surveys, and expert analyses on political polarization to compare current levels with the past.Gathering more details from key sources on polarization trends.Yes,”

  5. https://royalsocietypublishing.org/rsos/article/13/2/251428/479919/A-new-measure-of-issue-polarization-using-k-means

    Backs: “Clusters remained roughly equal in size (unusual globally), with more “sorting” (people aligning consistently with party/ideology labels).”

  6. 6pewresearch.orgNonprofits and think tanks
    https://www.pewresearch.org/politics/2022/08/09/as-partisan-hostility-grows-signs-of-frustration-with-the-two-party-system/

    Backs: “Unfavorable views of both parties have also risen. Partisan gaps on i”

  7. 7carnegieendowment.orgNonprofits and think tanks
    https://carnegieendowment.org/2022/01/18/what-happens-when-democracies-become-perniciously-polarized-pub-86190

    Backs: “Globally, polarization has risen in most regions since ~2005, but less extremely than in the U.S. in many cases.”

  8. 8cambridge.orgAcademic
    https://assets.cambridge.org/97811071/95929/frontmatter/9781107195929_frontmatter.pdf

    Backs: “Polarization is not new to the U.S., and the relatively low-polarization mid-20th century (roughly New Deal through the 1970s/early 1980s, with more cross-cutting cleavages and party overlap) was somewhat anomalous.”

  9. 9csusb.eduAcademic
    https://www.csusb.edu/inside/article/583321/scholars-examine-possibility-second-us-civil-war

    Backs: “Today’s divisions are intense and party-aligned but have not produced equivalent institutional collapse or mass violence (though political violence and threats have risen). Some scholars see similarities in demonization and media fragmentation, but the stakes and outcomes differ.”

  10. 10cnn.comNews and mediaquality 0.66
    https://www.cnn.com/2026/07/05/politics/trump-july-4-america-250-civil-war-analysis

    Backs: “Some historians argue today’s divides are not deeper than the 1960s or early republic in substantive terms, though they are more cleanly sorted along party lines and affect more of daily life via media. Others call current polarization the most dangerous since the Civil War precisely because of its partisan,…”

  11. 11news-gazette.comNot yet classified
    https://www.news-gazette.com/news/town-hall-how-deep-is-the-divide/article_0a36e1dc-31bd-488d-a7d1-8ee1a2d0d0b4.html

    Backs: “Some historians argue today’s divides are not deeper than the 1960s or early republic in substantive terms, though they are more cleanly sorted along party lines and affect more of daily life via media. Others call current polarization the most dang”

  12. 12mit.eduAcademic
    https://direct.mit.edu/rest/article/106/2/557/109262/Cross-Country-Trends-in-Affective-Polarization

    Backs: “Polarization has risen in many democracies (linked partly to social media, economic/cultural shifts, and elite behavior), but the U.S. is often an extreme case among established ones. Cross-national studies of affective polarization find the U.S.”