Today, most American citizens over the age of 18 are entitled to vote in federal and state elections, but voting was not always a default right for all Americans. The United States Constitution, as originally written, did not define specifically who could or could not vote—but it did establish how the new country would vote. Article 1 of the Constitution determined that members of the Senate and House of Representatives would both be elected directly by popular vote. The president, however, would be elected not by direct vote, but rather by the Electoral College. The Electoral College assigns a number of representative votes per state, typically based on the state’s population. This indirect election method was seen as a balance between the popular vote and using a state’s representatives in Congress to elect a president.

If you ever think that just one vote in a sea of millions cannot make much of a difference, consider some of the closest elections in U.S. history.

In 2000, Al Gore narrowly lost the Electoral College vote to George W. Bush. The election came down to a recount in Florida, where Bush had won the popular vote by such a small margin that it triggered an automatic recount and a Supreme Court case (Bush v. Gore). In the end, Bush won Florida by 0.009 percent of the votes cast in the state, or 537 votes. Had 600 more pro-Gore voters gone to the polls in Florida that November, there may have been an entirely different president from 2000–2008.

Your vote may not directly elect the president, but if your vote joins enough others in your voting district or county, your vote undoubtedly matters when it comes to electoral results. Most states have a “winner take all” system where the popular vote winner gets the state’s electoral votes. There are also local and state elections to consider. While presidential or other national elections usually get a significant voter turnout, local elections are typically decided by a much smaller group of voters.

Participating in elections is one of the key freedoms of American life. Many people in countries around the world do not have the same freedom, nor did many Americans in centuries past. No matter what you believe or whom you support, it is important to exercise your rights.

Do your part and Vote!