Which color was first used consistently as the Republican Party's official branding color in U.S. election maps and campaign materials?

Political campaigns and government agencies carefully select their brand colors to convey specific messages and values. These color choices have evolved over time and often carry deep symbolic meaning. This trivia question tests your knowledge of the history of political branding and how certain colors became associated with specific political movements or parties in the United States.

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Red (adopted widely after the 2000 presidential election)
Blue (used consistently since the 1950s until being switched to Democrats)
Purple (briefly used in the 1980s before settling on red)
Green (originally used until the environmental movement adopted it)