As Donald Trump returns to the White House, he has built the most formidable foundation of Republican electoral strength since the Ronald Reagan era in the 1980s. CNN values your feedback 1.

CNN's 1980 election night coverage shows the US map turned almost entirely blue, as Republican Ronald Reagan swept to victory ...

The idea that Republicans are red and Democrats are blue may, today, feel embedded in the symbolism, branding and vernacular — think “blue” states and “red” states — of US politics.

The idea of “red states” and “blue states” may feel deeply embedded in the symbolism of US politics, but before 2000 the colors were often the other way around.