Which historical event best fits the theme of "the defense of individual liberty"?

In 1920, the women's suffrage movement achieved its goal of securing women's right to vote.

Explanation:

Women's suffrage movement was struggling for a decade to make congress recognize their demand for voting extending to women. The two most active organizations were the National American Women Suffrage Association and the National Woman's Party. Thus in 1920, women fight for their liberty got recognized that too with a democratic process.

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