INSTITUTE INDEX: The deepening partisan divide in U.S. politics

In the wake of the latest election, number of state legislatures that have two chambers dominated by two different parties: 3

Number of state legislatures that are either under single-party control or have a unicameral legislature: 47

Percentage of state legislatures that now have partisan supermajorities, which can override governors' vetoes, change tax rates and put constitutional amendments on the ballot without participation by the other party: 50

Percentage of state legislatures that had partisan supermajorities four years ago: 26

Number of states with single-party control over both the legislative and executive branches: 32

The last year that one-party control of state legislatures was as great as it is now: 1928

Number of states that will be controlled by Republicans next year: 24

Number of states that will be controlled by Democrats: at least 13

Year in which Republicans last controlled both chambers of the Arkansas legislature: 1874

Number of years since Republicans last controlled both the legislative and executive branches in North Carolina: 143

In the latest round of redistricting, percentage of redrawn congressional districts configured by a partisan political process, as opposed to an independent commission or the courts: 60

Of those partisan-determined districts, number drawn by Democratic state legislators and governors: 44

By Republican state legislators and governors: 173

Number of congressional seats that likely flipped from Republican to Democratic control in the latest election because of redistricting: 9

Of those, number in the South: 1*

Number of congressional seats that likely flipped from Democratic to Republican control because of redistricting: 8

Of those, number in the South: 4**

Number of congressional seats that Republicans won but would have likely lost without redistricting: 8

Of those, number in the South: 3***

Number of seats Democrats held that they would likely have lost without redistricting: 1

Of those, number in the South: 0

Of the 79 outgoing members of Congress, percentage who will not return at least partly due to redistricting: over 50

* FL-22, where Lois Frankel (D) defeated Adam Hasner (R) for a seat formerly held by Rep. Allen West (R).

** KY-06: Andy Barr (R) defeated Rep. Ben Chandler (D); NC-08, where Richard Hudson (R) defeated Rep. Larry Kissell (D); NC-11, where Mark Meadows (R) defeated Hayden Rogers (D) for a seat was formerly held by Rep. Heath Shuler (D); and NC-13, where George Holding (R) defeated Charles Malone (D) for a seat formerly held by Rep. Brad Miller (D).

*** FL-10, where Rep. Daniel Webster (R) defeated Val Demings (D); NC-02, where Rep. Renee Ellmers (R) defeated Steve Wilkins (D); and TX-27, where Rep. Blake Farenthold (R) defeated Rose Harrison (D).

(Click on figure to go to source. Map from the National Conference of State Legislatures. For a larger version, click here.)