How Partisan Sorting Changed American Politics and Made Compromise Harder

When party affiliation stopped being about single issues and became a total identity, negotiation across the aisle became nearly impossible.

By Garret Merkley · Explainer · Jun 5, 2026

Branched from How American Political Discourse Changed and Why It Matters for National Unity

Quick take

Partisan sorting means Republicans and Democrats now differ on nearly everything—not just economics, but religion, lifestyle, and values—making them feel like opposing tribes rather than neighbors with different priorities.
This shift happened gradually as parties realigned on race, culture, and religion starting in the 1960s, and accelerated with cable news and social media that reward conflict.
When your opponent represents a fundamentally different worldview, compromise feels like betrayal rather than reasonable negotiation.

Partisan sorting is the process by which political parties have become more internally homogeneous and more different from each other. In the 1950s, a conservative Democrat in the South might agree with a liberal Republican in the Northeast on labor policy but disagree on civil rights. Today, if you know someone's stance on abortion, you can predict their views on gun control, immigration, taxation, and climate change with striking accuracy. The parties have sorted themselves into two nearly opposite camps on almost every major issue—and those camps increasingly reflect opposing worldviews, not just policy disagreements.

How the Parties Realigned

For much of the 20th century, both parties were ideologically mixed. Southern Democrats were often conservative on race and social issues. Northeastern Republicans were often liberal on economics and civil rights. This meant that across-the-aisle deals were common—you could find allies within the other party on specific issues.

The realignment began in the 1960s. The Civil Rights Act of 1964 pushed Southern segregationists toward the Republican Party. The cultural upheaval of the 1960s and 70s—on abortion, sexual liberation, and religion—sorted people by their fundamental values. By the 1980s and 90s, the parties had largely separated: Republicans became the party of social conservatism, lower taxes, and a stronger military; Democrats became the party of civil rights, social liberalism, and government programs. Crucially, these weren't separate dimensions anymore. Your position on taxes started to predict your position on abortion, which predicted your stance on immigration.

Why Media and Geography Locked It In

Two structural changes cemented sorting into place. First, cable news and later social media created information ecosystems where Republicans and Democrats consume almost entirely different news. Fox News and MSNBC don't just cover stories differently—they often cover different stories altogether. Second, Americans sorted themselves geographically. Democrats concentrated in cities and suburbs; Republicans in rural areas and exurbs. This meant fewer everyday interactions across party lines, fewer mixed marriages and friendships, and less social pressure to moderate.

Social media algorithms then amplified this. They reward engagement, and outrage engages. A moderate take gets scrolled past; a post demonizing the other side gets shared. Over time, the most partisan voices become loudest, and the median voter in each party moves further from the center. Compromise-minded politicians face primary challenges from more ideological opponents, so they learn to avoid the middle.

Why Sorting Makes Compromise Feel Like Betrayal

The deepest consequence of sorting is psychological. When parties disagreed on a few specific policies, compromise was straightforward—you split the difference. But when parties now represent opposing value systems—different views of religion, family, sexuality, the role of government, what counts as fair—compromise doesn't feel like negotiation. It feels like moral surrender.

A Republican legislator who supports gun rights because she believes in constitutional limits on government power can negotiate with a Democrat on background checks. But if that Democrat frames gun rights as indifference to children's safety, and the Republican frames gun control as totalitarianism, the same compromise becomes impossible. Each side isn't just disagreeing on policy; they're attributing malice or moral bankruptcy to the other. That's not a disagreement you can split. It's a clash of fundamental identities.

When and Why This Matters

Partisan sorting matters most during crises that require unified action—pandemic response, infrastructure, economic stimulus. It matters in Congress, where legislative deals require cross-party votes. It matters for local governance, where problems are often practical rather than ideological. It matters for the health of democracy itself, because when roughly half the country sees the other half as not just wrong but dangerous, the system's legitimacy erodes. If you believe the other party will destroy the country if it wins, you're more likely to see voting restrictions, election challenges, or even violence as justified self-defense.

The Sorting Paradox

Sorting makes each party more internally unified and ideologically consistent—which sounds efficient but actually makes legislating harder, because there's no room for the deal-making that requires ideological diversity within parties.

Signs Sorting Has Happened

Party affiliation predicts almost everything about your lifestyle, not just your politics—where you shop, what you watch, who you're friends with.
Partisan identity is now stronger than religious, regional, or occupational identity for many Americans.
Voters are more likely to oppose a policy if the other party proposes it, even if they supported the same policy when their own party proposed it (partisan polarization, not just sorting).
Straight-ticket voting is at historic highs—people vote for all Republicans or all Democrats, rather than mixing and matching.
Interparty marriage and friendship have declined significantly since the 1990s.

Is partisan sorting the same as political polarization?

No, though they're related. Sorting is structural—the parties have separated into distinct camps. Polarization is emotional—people feel more hostile toward the other side. You can have sorting without intense polarization, but sorting makes polarization more likely because it removes everyday cross-party contact and creates information bubbles.

Can sorting be reversed?

Partially, but not quickly. It would require deliberate effort to rebuild cross-party friendships, consume diverse media, and elect politicians willing to compromise. Some local communities have done this. Nationally, it would take a generation or more, and would require both parties to incentivize moderation over purity.

Why do media and algorithms make sorting worse?

Because conflict is profitable. A news network that shows both sides thoughtfully attracts fewer viewers than one that tells you the other side is dangerous. An algorithm that shows you moderate takes gets fewer clicks than one that shows you enraging content from the other side. The economic incentives reward sorting, not bridging.

Do other democracies have partisan sorting?

Many do, but the U.S. version is extreme. Countries with multiparty systems (Germany, Israel) have different sorting patterns because coalition-building forces compromise. Countries with stronger geographic or religious divides (UK, Canada) sometimes have regional sorting instead of national sorting. The U.S. combination of a two-party system, geographic sorting, and algorithmic media is particularly conducive to total partisan realignment.

If sorting makes compromise harder, how does anything get done?

It doesn't, efficiently. Congress's approval rating has tanked because it can't pass major legislation. When things do pass, it's often because one party has enough power to act alone, or because the issue is so urgent that parties must cooperate despite sorting (like the 2008 financial crisis). But routine governance—budgets, regulations, appointments—has become much slower and more contentious.