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

Yes, by most standard measures, political polarization in the United States is worse now than it has been for much of the past century—particularly relative to the mid-20th century low point—and it ranks among the higher levels in U.S. history outside extreme crises like the Civil War era. This holds across elite (congressional), mass issue-based, affective (emotional/tribal), and geographic dimensions, though nuances, asymmetries, and historical comparisons matter. Data primarily come from sources like DW-NOMINATE roll-call scores, American National Election Studies (ANES), Pew Research, and academic analyses.[1][1]

Congressional/Elite Polarization

Roll-call voting data (DW-NOMINATE scores) show Democrats and Republicans in the House and Senate are farther apart ideologically on average than at any time in the past 50 years. Both parties have become more internally cohesive (far fewer moderates: roughly two dozen today vs. over 160 in the early 1970s), with vanishing ideological overlap since the early 2000s.[1]

Bill co-sponsorship networks show similar rises in parties avoiding cross-aisle collaboration.

Mass/Public Issue Polarization and Sorting

Public opinion gaps on issues have widened. A Cambridge University analysis of ANES data (1988–2024, using clustering on issues like abortion, equality, race, health insurance, and traditional values) found divisions increased ~64% since 1988, with nearly all the rise after 2008 (a turning point linked to the financial crisis, Obama’s election, and smartphone/social media spread). It may have begun leveling during the Biden years but remains much higher than prior decades.[3][3]

Other studies confirm Democrats and Republicans have grown more ideologically distant over ~30 years, with both moving from the center (at different rates). Geographic sorting (homogeneous counties/precincts) roughly quintupled from 1976–2016 and correlates strongly with congressional polarization. Social identities (race, religion, culture) increasingly align with party.[2][4]

Affective Polarization (Emotional Dislike)

This has risen dramatically and is often described as the sharpest change among the public. ANES “feeling thermometer” scores (0–100 warmth ratings) show:

Partisan identity itself fuels much of this (beyond pure policy gaps), amplified by media fragmentation (cable news, social media algorithms favoring culture-war content) and nationalization of politics.[9]

Historical Context and Comparisons

There is no golden age of unity. High polarization occurred in the early Republic (Federalists vs. Democratic-Republicans around 1800, with Alien and Sedition Acts and secession talk), the lead-up to and aftermath of the Civil War (by far the peak, involving slavery, violence, and institutional collapse), and the late 19th/early 20th centuries (Gilded Age party conflicts). The 1960s featured intense cultural, racial, and Vietnam-related strife.[10][10]

Today’s levels rival intense non-Civil War periods on some metrics (congressional distance, partisan animosity, red-blue state policy divergence approaching Jim Crow-era differences on social issues). Differences include: deliberate amplification by leaders, 24/7 media/social media ecosystems creating separate information spheres, deeper identity sorting (party overlapping with race, religion, geography, culture), and a prolonged 50/50 national balance that sustains conflict without decisive realignment. Some historians argue underlying value divides are not uniquely severe compared to 1800 or the 1960s, but the partisan expression and institutional gridlock feel more pervasive.[10][10]

Polarization has historical roots in post-1960s realignments (civil rights, cultural changes) and has been rising for decades, not solely a Trump-era phenomenon (though it intensified under recent presidents). Some view it partly as the cost of progress on equality and pluralism.[11]

Caveats and Nuances

In short, polarization is measurably higher than in the relatively bipartisan mid-20th century and elevated by historical standards on key indicators, driven by elite sorting, public attitude shifts (especially post-2008), identity alignment, and media/technology. It is multifaceted rather than one-dimensional “extremism everywhere,” and trends are not inevitable or irreversible, as past high-polarization eras eventually depolarized through realignments or dominance by one side.