A National Movement
With skills in management, strategic thinking, and financial planning, Katharine continued as a driving force for the suffrage movement. In 1911, Katharine was appointed to the NAWSA board. Soon after, she also became a board member and corresponding secretary of the International Woman Suffrage Alliance (IWSA), led by Carrie Chapman Catt. Katharine's ability to speak German and French and extensive travel experience helped her in this international role.
By 1914, she had become both NAWSA’s treasurer and vice president. She managed the organization’s budget, increased its funding, trained state representatives, and participated in key voting rights parades, including the historic Women Suffrage Parade in Washington, DC, in 1913, the Boston Suffrage March in 1914, and the 1917 Grand Picket at the White House, on the eve of President Woodrow Wilson's second inauguration.
The suffragists finally won on August 18, 1920, when the 19th Amendment was ratified, giving women the right to vote. Determined to continue helping women after this milestone victory, Katharine began focusing on getting women access to birth control.