Which of these marked the achievement of a long-held suffragist goal in the early 1900s?

The Nineteenth Amendment, ratified in 1920, prohibited denying the right to vote on the basis of sex, achieving the suffragists’ long-held goal of women’s voting rights. Catt’s “Winning Plan” was a strategy to secure that right, not the achievement itself. The Fifteenth Amendment addressed voting rights regardless of race, and the Declaration of Sentiments was an earlier statement of women’s rights.

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