Since 2021, Democrats have controlled the House, the Senate and the presidency, and they’ve used that power to pass consequential legislation, from the American Rescue Plan to the Inflation Reduction Act. That state of affairs was exceptional: In the 50 years between 1970 and 2020, the U.S. House, Senate and presidency were only under unified party control for 14 years. Divided government has become the norm in American politics. And since Republicans won back the House in November, it is about to become the reality once again.

But that doesn’t mean policymaking is going to stop — far from it. As America’s national politics have become more and more gridlocked in recent decades, many consequential policy decisions have been increasingly pushed down to the state level. The ability to receive a legal abortion or use recreational marijuana; how easy it is to join a union, purchase a firearm or vote in elections; the tax rates we pay and the kind of health insurance we have access to: These decisions are being determined at the state level to an extent not seen since before the civil rights revolution of the mid-twentieth century.

Jake Grumbach is a political scientist at the University of Washington and the author of the book “Laboratories Against Democracy: How National Parties Transformed State Politics.” In it, Grumbach tracks this shift in policymaking to the states and explores its implications for American politics. Our national mythologies present state government as less polarizing, more accountable to voters and a hedge against anti-democratic forces amassing too much power. But, as Grumbach shows, in an era of national political media, parties and identities, the truth is a lot more complicated.

So this conversation is a guide to the level of government that we tend to pay the least attention to, even as it shapes our lives more than any other.

Mentioned:

Dynamic Democracy by Devin Caughey and Christopher Warshaw

“Does money have a conservative bias? Estimating the causal impact of Citizens United on state legislative preferences” by Anna Harvey and Taylor Mattia

State Capture by Alex Hertel-Fernandez

“From the Bargaining Table to the Ballot Box” by James Feigenbaum, Alexander Hertel-Fernandez and Vanessa Williamson

Paths Out of Dixie by Robert Mickey

“Old Money: Campaign Finance and Gerontocracy in the United States” by Adam Bonica and Jake Grumbach

Book Recommendations:

Fragmented Democracy by Jamila Michener

Private Government by Elizabeth Anderson

Dilla Time by Dan Charnas

Thoughts? Email us at ezrakleinshow@nytimes.com. (And if you’re reaching out to recommend a guest, please write  “Guest Suggestion” in the subject line.)

You can find transcripts (posted midday) and more episodes of “The Ezra Klein Show” at nytimes.com/ezra-klein-podcast, and you can find Ezra on Twitter @ezraklein. Book recommendations from all our guests are listed at https://www.nytimes.com/article/ezra-klein-show-book-recs.

“The Ezra Klein Show” is produced by Emefa Agawu, Annie Galvin, Jeff Geld, Rogé Karma and Kristin Lin. Fact-checking by Michelle Harris and Kate Sinclair. Original music by Isaac Jones. Mixing by Jeff Geld. Audience strategy by Shannon Busta.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.