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

I will research this using data and studies on polarization trends.Gathering more detailed data from key sources on historical trends.Yes, by several key modern metrics—particularly in the United States—political polarization is worse than it has been for decades (roughly since the mid-to-late 20th century), though it is not worse than the most extreme historical peaks like the Civil War era, and comparisons depend on the type of polarization measured (ideological/issue-based, affective/emotional, elite/congressional, or societal "us vs. them").[1]

Polarization has multiple dimensions, and data show rises in most of them in recent decades, with acceleration often noted around or after 2008 (financial crisis, Obama election, rise of smartphones/social media). It is not uniform globally or across all measures, and some underlying value differences have been more stable while partisan sorting (alignment of views, identities, and demographics with parties) has intensified the divide.[2]

Elite and Congressional Polarization

In the U.S. Congress, Democrats and Republicans are farther apart ideologically than at any point in the past 50 years, based on DW-NOMINATE scores from roll-call votes (comparable over time). Both parties have become more cohesive internally, with far fewer moderates (from over 160 in the early 1970s to about two dozen recently). Overlap between the parties (members of one party more moderate than some of the other) has vanished since the early 2000s. Republicans have shifted more to the right on average than Democrats to the left in this period, though both moved away from the center. Geographic/demographic sorting (e.g., more Southern Republicans, more diverse Democrats) has reinforced this.[1]

Longer historical data show high polarization in the late 19th century (Reconstruction/Gilded Age), with levels comparable to or exceeding today’s in some congressional metrics. The mid-20th century was a relative low point due to cross-party coalitions (e.g., conservative Southern Democrats). Today’s levels rival or match those high historical points in partisan terms but occur in a more nationalized, media-saturated context.[3]

Public Issue/Ideological Polarization

A 2026 University of Cambridge study using machine learning (k-means clustering) on American National Election Studies (ANES) data (over 35,000 responses, 1988–2024) found that the “separation” between left- and right-leaning opinion clusters rose 64% overall since 1988—with nearly all the increase after 2008. It was relatively flat in the 1990s and early 2000s, rose sharply through ~2020, and may have leveled off somewhat during the Biden years, though it remains far higher.[4]

This was driven primarily by the left/progressive cluster becoming substantially more socially liberal (about 31.5% more so by 2024 vs. 1988 on surveyed issues like abortion, equality, traditional values, health insurance, and race), while the right shifted only modestly more conservative (~2.8%). “Sorting” also rose: people more consistently align their self-identified party/ideology with their issue positions. Within-cluster opinion diversity stayed relatively stable, and the two clusters remain roughly equal in size (unusual globally; many countries have lopsided majorities). The study notes divisions are still “fuzzy” rather than fully tribal on every issue.[5]

Other analyses confirm Democrats and Republicans have become more distant on issues over ~30 years, with both moving from the center (at different rates), though some demographic groups’ ideological distances have been more stable.[6]

Affective (Emotional) Polarization

This measures dislike or animosity toward the opposing side (vs. policy disagreement). ANES feeling thermometer data (0–100 scale, “warm” to “cold”) show a clear rise: in-party ratings have stayed relatively stable/high (~70), while out-party ratings have plummeted (from near-neutral ~45–50 in the late 1970s/1980s to ~20–26 in the 2020s). The gap (affective polarization) has roughly doubled or more, from ~20–25 points to ~50+.[7]

Out-party hate increasingly outweighs in-party love as a driver, and it correlates with lower tolerance and more like-minded discussion networks. The U.S. has shown one of the largest increases among OECD/established democracies over recent decades.[8]

Societal/"Pernicious" Polarization (V-Dem and Broader Measures)

The Varieties of Democracy (V-Dem) project measures the extent to which society divides into antagonistic camps that undermine social relationships (e.g., reluctance to interact across lines in family, work, or civic life; scale 0–4). The U.S. score was modest (~2) around 2000 but rose sharply, reaching “pernicious” levels (around or above 3) since ~2015 and remaining high (near 3.8–4 in recent years). It stands out as the only wealthy, long-standing Western democracy with persistent pernicious polarization; peers rarely reached such levels even briefly (e.g., France briefly in 1968). Polarization has risen globally since ~2005 in most regions, but the U.S. trajectory is steeper among stable democracies.[9]

Historical Context and Caveats

In short, relative to the post-WWII/mid-to-late 20th-century baseline of greater bipartisanship and less sorted publics, yes—polarization (especially affective and elite) is worse and has intensified notably since the late 2000s. Absolute historical highs (Civil War) were worse in destructive outcomes. Trends can reverse or stabilize (as some recent data hint), and depolarization has occurred historically after shocks or realignments, though sustaining it in liberal democracies at high levels is rare. Causes debated include media, inequality, identity sorting, elite strategies, and cultural shifts, but the data trends are robust across multiple sources.