For just the second time in more than seven decades, a Democrat will carry Arizona in a presidential election, a monumental shift for a state that was once a Republican stronghold.

CNN projected on Thursday that President-elect Joe Biden will carry Arizona, defeating President Donald Trump and providing Democrats in Arizona and the universe of allied grassroots organizations in the state with a crowning achievement a decade in the making.

Biden’s win in the state that propelled Republican leaders like Barry Goldwater and John McCain to national prominence could foretell problems for the party going forward. Three key shifts in the state helped Democrats this year: a growing Latino population that leans Democratic, a surge in voters moving to Arizona from more liberal states like California and Illinois, and the way suburban voters have starkly broken with a Republican Party led by someone like Trump.