By a vote of 219 to 212 (proponents notching just one more vote than a simple majority) the U.S. House Friday approved the American Clean Energy and Security Act, legislation that would implement a cap-and-trade system to cut greenhouse gas emissions.

Debate of the bill had shown that along with party-line splits, the fate of climate legislation in the House relied on overcoming regional differences. Members generally kept with party rank, with the notable exceptions of eight Republicans who showed support for ACES and 44 Democrats who voted against the bill (see map below).

Maps from the National Journal, NYT and 538 offer greater detail and perhaps some context to the democratic defections and provide some insight into how regional differences may have influenced this vote.

For more on the regional outcomes of climate policy see this RFF discussion paper, and posts here and here.

Tiffany Clements is managing editor of Weathervane.