The Progressive Era was a period of widespread social activism and political reform in the United States from the 1890s to the 1920s. During this time, numerous reforms were implemented to address issues such as political corruption, economic inequality, and labor rights. One of the pivotal reforms was the introduction of women's suffrage, which sought to grant women the right to vote. Proponents argued that women's participation in the electoral process was essential for a truly representative democracy.
Which of the following amendments to the U.S. Constitution is most directly related to the efforts of the women's suffrage movement during the Progressive Era?