Swing States

The Sunbelt Shift: How Arizona, Georgia, and Nevada Rewrote the Electoral Map

Three states that were reliably red a decade ago now sit at the center of every presidential campaign's strategy. We examine the demographic forces behind the shift.

The 270 Project··8 min read

The old Electoral College map is changing. Arizona and Georgia moved from Republican strongholds to genuine battlegrounds, while once-Democratic Nevada has become increasingly competitive. Together, the three states illustrate why neither party can take the growing Sun Belt for granted.

For decades, presidential campaigns could look at much of the Sun Belt and make relatively comfortable assumptions. Arizona was Republican territory. Georgia was even more reliably Republican in presidential elections. Nevada followed a different trajectory, supporting Democrats in presidential contests from 2008 through 2020.

Then the lines began moving.

By 2020, Joe Biden became the first Democratic presidential nominee to carry Arizona since Bill Clinton in 1996 and the first to carry Georgia since Clinton in 1992. Nevada remained Democratic, but only narrowly. Four years later, Donald Trump carried all three states.

That sequence is important because it demonstrates something more complicated than a simple red-to-blue transformation. The Sun Belt did not become Democratic. It became competitive.

Arizona, Georgia, and Nevada now represent 33 electoral votes—11, 16, and 6 respectively. In an election in which 270 determines the presidency, that is enough electoral weight to provide alternative routes to the White House when the traditional Pennsylvania-Michigan-Wisconsin path breaks down.

Understanding how these states arrived here offers a window into the changing structure of American presidential elections.

Arizona: From Republican Stronghold to Battleground

Arizona provides perhaps the clearest example of political transformation.

In 2012, Republican Mitt Romney carried Arizona by roughly nine percentage points. Four years later, Donald Trump's margin fell to approximately 3.5 points. Then, in 2020, Biden carried the state by only 10,457 votes—a margin of 0.31 percentage points. (U.S. Election Atlas)

Four years later, the state moved back toward Republicans. Trump defeated Kamala Harris by approximately 187,000 votes, or 5.5 percentage points, in 2024. (U.S. Election Atlas)

That does not look like a state undergoing a simple ideological conversion. It looks like a competitive electorate capable of moving substantially between elections.

Population growth is part of the story. Arizona's population increased from approximately 6.39 million in the 2010 Census to 7.15 million in 2020—an increase of 11.9 percent. (Census Bureau)

Growth has changed the size and composition of the electorate, particularly in metropolitan Arizona. But demographics alone do not determine political outcomes.

The same electorate that supported Trump for president in 2024 also elected Democrat Ruben Gallego to the U.S. Senate. AP reported that Gallego outperformed Harris and attracted support from some voters who simultaneously voted for Trump. (AP News)

That phenomenon—ticket splitting—matters enormously. It means some Arizona voters are not simply choosing a party. They are making distinctions among individual candidates.

Arizona therefore should not automatically be described as "red" or "blue." Its recent history suggests a more useful designation: persuadable.

The state's 2026 voter-registration numbers reinforce the complexity. As of July, Republicans accounted for about 35.4 percent of registered voters, Democrats 28.1 percent, while approximately 34.6 percent were categorized as "Other." (Arizona Secretary of State)

Georgia: The Transformation of Metropolitan Atlanta

Georgia's movement was even more historically significant. For years, Georgia was treated as a dependable Republican presidential state. Democrats had not carried it since 1992.

Biden defeated Trump by just 11,779 votes, approximately 0.24 percentage points, making Georgia the closest state in the presidential election. (U.S. Election Atlas)

That victory did not establish Georgia as a Democratic state. The 2024 election demonstrated why. Trump returned Georgia to the Republican column, defeating Harris by 115,100 votes, or approximately 2.18 percentage points. (U.S. Election Atlas)

Georgia's extraordinary population growth provides important context. The state grew from approximately 9.69 million residents in 2010 to 10.71 million in 2020—a 10.6 percent increase.

Much of the political attention surrounding that growth has centered on metropolitan Atlanta and its suburbs. The result is an increasingly complicated statewide coalition: heavily Democratic urban constituencies, substantial Black voter participation, changing suburban communities, growing populations of Asian and Latino residents, and large Republican constituencies across much of the rest of the state.

Georgia therefore presents campaigns with a geographic balancing problem. Large margins in Atlanta are not sufficient by themselves. Nor can Republicans rely exclusively on overwhelming rural margins without considering changes in the metropolitan electorate.

Nevada: A Different Kind of Realignment

Nevada complicates the "Sun Belt turning blue" narrative because its trajectory moved in the opposite direction.

Obama carried Nevada by approximately 6.7 points in 2012. Clinton won it by approximately 2.4 points in 2016. Biden carried it by approximately 2.4 points in 2020. (U.S. Election Atlas)

Then the state flipped. In 2024, Trump carried Nevada by approximately 3.1 percentage points, becoming the first Republican presidential nominee to win the state since George W. Bush in 2004. (U.S. Election Atlas)

Nevada therefore tells almost the inverse story of Arizona. Arizona demonstrates how a historically Republican state can become competitive. Nevada demonstrates how a state that had consistently supported Democratic presidential nominees can also become competitive.

And that is why the three states belong in the same conversation. The larger phenomenon is volatility, not inevitable partisan realignment.

Demography Is Not Destiny

There is a temptation in American politics to look at demographic changes and extrapolate election results decades into the future. A state becomes more diverse, therefore it will become Democratic. A state attracts retirees, therefore it will become Republican.

Actual elections are considerably messier. Voters are not demographic statistics programmed to behave identically from one election to another.

Arizona demonstrated that dramatically in 2024: Trump won the presidential contest while Gallego won the Senate contest. (AP News)

Population change creates electoral opportunity. It does not guarantee electoral outcomes. Candidate quality, economic conditions, turnout, immigration, abortion, housing costs, foreign policy, cultural issues, perceptions of the incumbent administration, and dozens of other variables can affect how particular groups vote.

A Mexican-American voter in Arizona is not necessarily politically interchangeable with a Cuban-American voter in Florida. A suburban Atlanta voter does not necessarily behave like a suburban Phoenix voter. A unionized hospitality worker in Las Vegas may prioritize different issues than a technology professional who recently relocated to the Phoenix metropolitan area.

The Electoral College Consequences

This matters because presidential campaigns do not need to win every battleground. They need combinations totaling 270 electoral votes.

Under the current Electoral College allocation, Arizona contributes 11, Georgia 16, and Nevada 6. Together: 33 electoral votes.

The traditional Democratic battleground strategy has placed enormous emphasis on Pennsylvania, Michigan, and Wisconsin. Together those three states provide 44 electoral votes. But an Electoral College strategy becomes much more resilient when Sun Belt states provide alternative combinations.

This does not mean that any of these states can currently be assigned to either party for 2028. Presidential elections are candidate-specific, economic and political circumstances change, and two years remain before voters choose the next president. What the recent results establish is simply that all three have demonstrated the capacity to vote differently across successive elections.

The New Battleground Is Metropolitan

There is another pattern connecting these states: Phoenix. Atlanta. Las Vegas. Three rapidly evolving metropolitan areas increasingly important to their states' political identities.

The political geography of modern America increasingly reflects a divide among large metropolitan cores, suburbs, exurbs, smaller cities, and rural communities. That makes suburban margins particularly consequential.

A party does not necessarily need to dominate every region. Presidential politics frequently comes down to the size of the margins. A candidate can lose rural counties overwhelmingly and still win statewide by accumulating enormous metropolitan margins.

Presidential campaigns are ultimately exercises in assembling thousands of these margins into a statewide majority.

The Sun Belt Is Now Part of the Road to 270

The American Electoral College used to be described largely through familiar regional blocs. The Democratic "Blue Wall." The Republican South. The industrial Midwest. The coasts.

Those categories still matter, but they are increasingly incomplete. Population growth has given the Sun Belt greater political importance, while changing metropolitan areas and evolving voter coalitions have made several states more competitive.

Arizona moved from reliably Republican to competitive. Georgia moved from reliably Republican to competitive. Nevada moved from consistently Democratic in presidential elections to competitive.

These states have not rewritten the electoral map by permanently switching sides. They have rewritten it by becoming places where both parties have something to win—and something to lose.

For anyone thinking seriously about the path to 270, that may be the more consequential change.