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Each branch of government controls a certain aspect of the other.
Legislative can restrict the policies of the executive and judicial.
Judicial can strike down legislation deemed unconstitutional, and undo executive decisions through rulings on their constitutionality.
Executive Orders can bypass legislative channels for more efficient decision making, and can nominate if not alter the Supreme Court along with taking part in it's processes. ( Some of this is my own interpretation. )
The correct answer to this open question is the following.
Unfortunately, you did not attach the excerpt of the book or a link to it.
However, although you forgot to include this important information, we can help you with the following comments.
The example could support the author's main purpose in the book -like other similar books- in that it shows the long and difficult road that passed before the federal government could grant women the right to vote.
It is true that before women were allowed to vote, both men and women organized, protested, and marched until the 19th Amendment to the Constitution gave women the right to vote in 1920.
We can refer to history and focus on the beginning of the women's suffrage movement that started during the Seneca Falls Convention of July 1848, in Seneca Falls, New York. An event organized by Lucretia Mott and Elizabeth Cady Staton. That long was the road to the 19th Amendment to the United States Constitution.