What Equality?

I heard today is celebrated as the Women's Equality Day.Frankly speaking, I have never heard of such a Day existing. Nor am I aware of the reasons behind any celebration.Which women? What equality? Prez Bush said today that

On Women's Equality Day, we recognize the hard work and perseverance of those who helped secure women's suffrage in the United States. With the ratification of the 19th Amendment to the Constitution in 1920, American women gained one of the most cherished rights and fundamental responsibilities of citizenship: the right to vote.

But I wonder if Right to Vote has anything to do with equality? With dignity? With life?