Colorado ratified the Nineteenth Amendment on December 15, 1919. This was the first time in American history that a state voters’ referendum would enfranchise women.  Other states followed suit and enfranchised women through successful ballot referenda before the passage of the 19th Amendment.

To learn when American women across the United States were enfranchised, before or after the Nineteenth Amendment, see When did women in your state get the right to vote?

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