From USA.gov, this page provides different types of information about elections and voting: general information, educational materials, electoral college, election history, election officials and candidates, legislation and reform, and organizations and agencies.
"Rock the Vote is the largest non-profit and non-partisan organization in the United States driving the youth vote to the polls. Fusing pop culture, politics, and technology, Rock the Vote works to mobilize the millennial voting bloc and the youth vote, protect voting rights, and advocate for an electoral process and voting system that works for the 21st century electorate."
From the Library of Congress, this page provides information about the 15th Amendment—"The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude."—and links to additional resources
From the National Archives and Records Administration, this page provides a brief history behind the 19th Amendment—"The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex."