Why is red for Republicans and blue for Democrats?

In any 2020 electoral map, the color scheme is clear: Red is for Republicans, blue is for Democrats. But where did this universal agreement on color-coding come from? 

It’s relatively new. Though red and blue have often been used to stand in for opposing sides in U.S. political history, it’s only since the 2000 election that red and blue have been assigned to the political parties consistently. 

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