The Fracturing of the American Center
For decades, political scientists told us the center would hold. They were wrong about the center — and wrong about what held it together in the first place.
The phrase "the center must hold" has been used so many times in American political commentary that it has achieved the status of a cliché — which is to say, it has ceased to mean anything. We repeat it as a kind of secular prayer, hoping the incantation does the work the argument cannot. But recently, a more disturbing possibility has crystallized: the center never held in the way we thought it did. What we called the center was a temporary equilibrium produced by specific historical conditions, and those conditions no longer obtain.
To understand what I mean, you have to go back to the mid-20th century, when the ideological geography of American politics was genuinely scrambled. The New Deal coalition that dominated the Democratic Party included both Black Americans in Northern cities and white segregationists in the South. The Republican Party contained both Western libertarians and East Coast Rockefeller liberals who would be unrecognizable by today's party's standards. These were not coalitions of ideological agreement — they were arrangements of convenience, held together by patronage, tradition, and a set of enemies (fascism, then communism) that made intra-coalition differences seem secondary.
The "center" that political scientists celebrated during this period was not a location on the ideological spectrum but a product of this peculiar cross-cutting structure. Because both parties contained their own contradictions, both parties were forced to moderate. The Democrats couldn't push too far left without losing their Southern base. The Republicans couldn't push too far right without losing their Northern moderates. The extremists in both parties were effectively imprisoned by the internal architecture of their own coalitions.
What happened between 1960 and 2000 was not the loss of the center but the sorting of these coalitions into coherent ideological blocs. The Civil Rights Act drove the Southern Democrats toward the Republicans. The social and cultural revolutions of the 1960s and 1970s drove moderate suburbanites away from a party they increasingly found alien. By the time Bill Clinton declared that the era of big government was over, he was trying to hold together a coalition that was already dissolving around him.
This sorting is now essentially complete. The parties today are nearly uniform in their ideological composition. A conservative Democrat is a statistical rarity; a liberal Republican is almost extinct. Political scientists call this "party sorting," and they have generally treated it as a neutral descriptive fact. But it has a structural consequence that is anything but neutral: it has removed the internal checks that once forced both parties toward moderation.
This brings us to the current moment, which is less a crisis of the center than a crisis of the mechanisms that used to produce centrism.
Those mechanisms were institutional as much as ideological. The committee system in Congress rewarded seniority and punished insurgency. The filibuster gave minorities leverage to extract compromise. The primary system was dominated by party elites who understood that general elections required broader coalitions than primaries. The media landscape was narrow enough that there was, functionally, a mainstream — a set of premises and interpretations that most Americans shared, even in disagreement.
Each of these mechanisms has eroded. The committee system has been hollowed out in favor of leadership-controlled operations. The filibuster has been used so promiscuously that it is under permanent threat of elimination. Primary elections have moved control from party establishments to activists, who trend more ideological than the broader electorate. And the media landscape has fragmented into a thousand different information environments, each with its own set of facts.
What we call polarization is the accumulated effect of these institutional collapses. It is not primarily a story about voters becoming more extreme — the evidence for mass polarization is actually quite mixed. It is a story about political institutions becoming increasingly unable to aggregate diverse preferences into coherent governing coalitions.
The irony is that most Americans, when surveyed on specific policy questions — as opposed to partisan identification — remain stubbornly moderate. Large majorities support gun background checks, pathways to citizenship, higher taxes on the wealthy, and limits on late-term abortion. But these preferences find no institutional expression in a political system increasingly organized around symbolic confrontation rather than substantive governance.
There is a revisionist account that attributes all of this to one party's radicalization, and a counter-revisionist account that claims the problem is symmetrical. Both miss the structural point. The question is not whether Republicans or Democrats are more extreme; the question is why our institutions have lost the capacity to channel political energy into policy.
Part of the answer involves money. The post-Citizens United landscape has supercharged the influence of ideologically motivated donors who have strong preferences for purity over compromise. Unlike corporate donors, who generally want access and stability, ideologically motivated donors want victories on specific issues, and they are prepared to primary moderate incumbents to get them.
Part of the answer involves what sociologists call "affective polarization" — the increasing tendency for partisan identity to function less like a policy preference and more like a tribal identity. We dislike the other party not because we have carefully considered their positions and found them wanting, but because we associate them with people who are not like us. This shift has been documented extensively in survey research, and it has a crucial implication: because affective polarization is about identity rather than policy, there are no policy concessions that can dissolve it. The cure for tribal polarization is not better policy — it is some combination of social mixing and institutional redesign that lowers the stakes of political competition.
Neither of those is on offer.
What does a fracturing center actually look like in practice? It looks like a Congress that passes major legislation through reconciliation procedures rather than broad bipartisan coalitions, because the 60-vote threshold for regular order has become functionally unreachable. It looks like a presidency that governs through executive orders that the next administration reverses on day one. It looks like a Supreme Court whose decisions are predictable by the partisan composition of its appointers, destroying the institution's claim to stand above politics. It looks like a state-level governance that increasingly diverges from federal norms — some states moving toward maximum restriction on abortion, others toward maximum expansion; some states embracing universal healthcare through state mechanisms, others refusing federal Medicaid expansion decades after it became available.
These divergences are not, in themselves, unprecedented in a federal system. But they have a cumulative effect on political culture: they reinforce the sense that there is no shared national community with shared stakes. When Americans in different states live under genuinely different legal regimes — different rules about reproductive rights, different rules about gun ownership, different rules about voting — the idea of a common citizenship becomes increasingly notional.
This is the deepest fracture. Not the polarization of elites, which has been with us for decades. Not even the institutional collapse of compromise mechanisms. The deepest fracture is in the underlying sense that we are a single people with a shared fate, whose conflicts are, at bottom, arguments within a community rather than conflicts between communities.
Whether that sense can be restored — and what would restore it — is a question I don't know how to answer. What I'm confident of is this: it won't be restored by repeating the prayer that the center must hold. The center that held was never merely a location on a policy spectrum. It was a set of shared institutions, a set of cross-cutting social relationships, and a set of stories we told about ourselves that made political compromise feel like a civic virtue rather than a betrayal. Those stories have been replaced. The question is what will replace the replacements.
Elena Vasquez is a staff writer at The Auguro covering American politics and democratic institutions. She is the author of The Unfinished Republic: Democracy Under Pressure (2024).