Answer:
World War I marked a before and after in the suffrage movement. The fact that many men left to the front and many women had to replace them in their respective jobs led to an increase in the valuation of women and their role in society, removing it from the intra-family environment and placing it alongside men in terms of their ability to generate income and manage a family at an economic level. This, coupled with the values of freedom and democracy that the American army was fighting in Europe, made a change of mentality regarding the role of women occurred during those years.
Partly thanks to this ideological change, added to the struggle that began in 1848 with the Declaration of Seneca Falls, in 1920 the Nineteenth Amendment was approved, guaranteeing the female vote in the United States.