When did red consistently become associated with the Republican Party and blue with the Democratic Party in U.S. election maps and political branding?

In political campaigns, brand colors are not chosen by accident. They communicate values, evoke emotions, and create instant recognition. Throughout history, certain color schemes have become strongly associated with political parties and movements around the world. This trivia question tests your knowledge about an interesting shift in American political party color representation that many people don't realize is relatively recent.

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Since the 1980 Reagan election
After the 2000 presidential election between Bush and Gore
During the Civil War era (1860s)
Following the 1968 Nixon campaign's branding strategy