If you were listening to Hillary Clinton's speech on the second night of the Democratic National Convention, you might have been thinking about women's history, because her "18 million cracks in the glass ceiling" were themselves part of women's history. But Clinton also brought in two other key women's history topics: the Seneca Falls 1848 Women's Rights Convention, and the underground railroad work of Harriet Tubman. Read more about these two events:

• Seneca Falls Women's Rights Convention - 1848
• Harriet Tubman - From Slavery to Freedom

Courtesy Library of Congress, modifications © 2008 Jone Johnson Lewis
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• Suffrage - What You Need to Know

In Michelle Obama's speech to the Democratic Convention on August 25, she referred to the anniversary honored today: the anniversary of the day women in the United States won the vote. The long battle for the vote for women was finally won when a young legislator voted as his mother urged him to vote. This week, Americans honor this victory with Women's Equality Day.

• August 26, 1920 - Nineteenth Amendment Becomes Law
• Women's Equality Day
• Women's Suffrage: What You Need to Know

Dolores Huerta, who was a co-founder of the United Farm Workers, is less well-known than Cesar Chavez, but her role in that organization was crucial to its success.

I think of Dolores Huerta with another image in addition to her crucial role in labor history. In 1976, I attended a dinner where she was to be honored for her contributions to social change. My older son was only a few months old at the time, and during one part of the evening, I left the main room to nurse him. I found myself next to Huerta, also nursing one of her children, and we exchanged typical new-mother oohs and aaahs over each other's children and spoke briefly of issues of working motherhood. Much of the world knows Huerta -- correctly -- as a tough negotiator, a strong leader. My image of her also includes Huerta the mother. And I don't think the two images conflict in the least.

Read the biography: Dolores Huerta