Nations normally die slowly when people turn away from their cultural foundations. Political parties are similar, even more closely reflecting the shifts in public thinking because they make up a smaller portion of the electorate.
The Republican Party morphed in 2016. The change has been coming for decades but catalyzed this year when a secular icon named Donald Trump ran for president. Trump brought records numbers of people into party of Lincoln--but many aren't following the worldview of Honest Abe.
The Republican Party as we've previously known it is dead. Gone.
In its place we have the rise of the Secular Regressives.