Which best describes the author’s purpose in "A History of Voting Rights”? to persuade readers to exercise their right to vote
to entertain readers with stories about voting-rights activists
to inform readers about the history of voter oppression
to educate readers about the current state of voting laws

To inform readers about the history of voter oppression.

Explanation:

The story itself is about voting and the right to vote, the author intended to talk about the troubles some citizens faced during these times of the elections. As it says in the story, "Women were considered ill-suited to decide upon matters of politics, as they traditionally were responsible for taking care of the home." which refers to the oppression women faced back in that time,

So the answer is "To inform readers about the history of voter oppression."

Good luck!