Why was the right to vote given to more and more people between 1867 and 1918?

The expansion of the right to vote between 1867 and 1918 was driven by various social and political movements advocating for democratic reforms and greater representation. The rise of labor unions, women's suffrage movements, and civil rights activism highlighted the demand for inclusivity in the political process. Additionally, significant historical events, such as World War I, shifted public perception towards the need for broader participation in democracy. Legislative changes, including the 15th and 19th Amendments in the United States, reflected these growing calls for universal suffrage.