The correct answer to this open question is the following.
This action ensures a democratic society in which the views of the people are reflected in government. Citizens of a nation have the right to choose their leaders rather than leaders being born into a position or appointed. The action that is being described is the citizen's participation in elections. And this is is a right and a civic responsibility.
One of the most important characteristics of modern democracy is that citizens have the right, but also the civic responsability to vote, which menas to participate in elections to choose their President and their representatives. That, in the case of the United States, they are part of the US Congress which is divided into two chambers: the lower chamber or House of Representatives, and the upper chamber of the Senate.