Voting methods A number of voting methods are used within the various jurisdictions in the United States, the most common of which is the
first-past-the-post system, where the highest-polling candidate wins the election. Under this system, a candidate who achieves a
plurality (that is, the most) of vote wins. The
State of Georgia uses a
two-round system, where if no candidate receives a majority of votes, then there is a runoff between the two highest polling candidates. Since 2002, several cities have adopted
instant-runoff voting. Voters rank the candidates in order of preference rather than voting for a single candidate. Under this system, if no candidate achieves more than half of votes cast, then the lowest polling candidate is eliminated, and their votes are distributed to the next preferred candidates. This process continues until one candidate achieves more than half the votes. In
2016,
Maine became the first state to adopt instant-runoff voting (known in the state as ranked-choice voting) statewide for its elections, although due to state constitutional provisions, the system is only used for federal elections and state primaries.
Eligibility The eligibility of an individual for voting is set out in the constitution and also regulated at state level. The constitution states that suffrage cannot be denied on grounds of
race or color,
sex, or
age for citizens eighteen years or older. Beyond these basic qualifications, it is the responsibility of
state legislatures to regulate voter eligibility. Some states ban convicted criminals,
especially felons, from voting for a fixed period of time or indefinitely. The number of American adults who are currently or permanently ineligible to vote due to felony convictions is estimated to be 5.3 million. Some states also have legacy constitutional statements barring those legally declared incompetent from voting; such references are generally considered obsolete and are being considered for review or removal where they appear. About 4.3 million American citizens that reside in
Washington, D.C.,
Puerto Rico and other U.S. territories do not have the same level of federal representation as those that reside in the 50 U.S. states. These areas only have
non-voting members in the U.S. House of Representatives and no representation in the U.S. Senate. Citizens in the U.S. territories are also not represented in the Electoral College and therefore cannot vote for the president. Those in
Washington, D.C. are permitted to vote for the president because of the
Twenty-third Amendment.
Voter registration While the federal government has jurisdiction over federal elections, most election laws are decided at the
state level. All U.S. states except
North Dakota require that citizens who wish to vote be
registered. In many states, voter registration takes place at the county or municipal level. Traditionally, voters had to register directly at state or local offices to vote, but in the mid-1990s, efforts were made by the federal government to make registering easier, in an attempt to increase turnout. The
National Voter Registration Act of 1993 (the "Motor Voter" law) required state governments that receive certain types of federal funding to make the voter registration process easier by providing uniform registration services through drivers' license registration centers, disability centers, schools, libraries, and mail-in registration. Other states allow citizens same-day registration on Election Day. An estimated 50 million Americans are unregistered. It has been reported that registering to vote poses greater obstacles for
low-income citizens,
racial minorities and
linguistic minorities,
Native Americans, and
persons with disabilities. International election observers have called on authorities in the U.S. to implement measures to remediate the high number of unregistered citizens. In many states, citizens registering to vote may declare an affiliation with a
political party. This declaration of affiliation does not cost money, and does not make the citizen a dues-paying member of a party. A party cannot prevent a voter from declaring his or her affiliation with them, but it can refuse requests for full membership. In some states, only voters affiliated with a party may vote in that party's
primary elections (
see below). Declaring a party affiliation is never required. Some states, including
Georgia,
Michigan,
Minnesota,
Virginia,
Wisconsin, and
Washington, practice non-partisan registration.
Noncitizen voting Federal law prohibits
noncitizens from voting in federal elections. As of 2024, 7 state constitutions specifically state that "only" a citizen can vote in elections at any level in that state: Alabama, Arizona, Colorado, Florida, Louisiana, North Dakota, and Ohio.
Voter ID laws Voter ID laws in the United States are laws that require a person to provide some form of
official identification before they are permitted to
register to vote, receive a
ballot for an
election, or to actually vote in elections in the United States. Proponents of voter ID laws argue that they reduce
electoral fraud while placing only little burden on voters. Critics worry the costs to voters without IDs will outweigh unclear benefits it would have on
real or
perceived fraud.
Absentee and mail voting Voters unable or unwilling to vote at polling stations on
Election Day may vote via
absentee ballots, depending on state law. Originally these ballots were for people who could not go to the polling place on election day. Now some states let them be used for convenience, but state laws still call them absentee ballots. Otherwise a voter must request an absentee ballot before the election occurs. In
Colorado,
Hawaii,
Oregon,
Utah and
Washington state, all ballots are delivered through the mail; in many other states there are counties or certain small elections where everyone votes by mail. As of July 2020, 26 states allow designated agents to collect and submit ballots on behalf of another voter, whose identities are specified on a signed application. Usually such agents are family members or persons from the same residence. 13 states neither enable nor prohibit ballot collection as a matter of law. Among those that allow it, 12 have limits on how many ballots an agent may collect. Americans living outside the United States, including active duty members of the armed forces stationed outside of their state of residency, may register and vote under the
Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA). Almost half the states require these ballots to be returned by mail. Other states allow mail along with some combination of
fax, or
email; four states allow a web portal. A significant measure to prevent some types of fraud has been to require the voter's signature on the outer envelope, which is compared to one or more signatures on file before taking the ballot out of the envelope and counting it. Not all states have standards for signature review. There have been concerns that signatures are improperly rejected from young and minority voters at higher rates than others, with no or limited ability of voters to appeal the rejection. For other types of errors, experts estimate that while there is more fraud with absentee ballots than in-person voting, it has affected only a few local elections. Following the
2020 United States presidential election, amidst
disputes of its outcome, as a rationale behind litigation demanding a halt to official
vote counting in some areas, allegations were made that vote counting is
offshored.
Former Trump Administration official Chris Krebs, head of the
Cybersecurity and Infrastructure Security Agency (CISA) during the election, said in a December 2020 interview that, "All votes in the United States of America are counted in the United States of America." One documented trend is that in-person votes and early votes are more likely to lean to the
Republican Party, while the provisional ballots, which are counted later, trend to the
Democratic Party. This phenomenon is known as
blue shift, and has led to situations where Republicans were winning on election night only to be overtaken by Democrats after all votes were counted. Foley did not find that mail-in or absentee votes favored either party.
Early voting Early voting is a formal process where voters can cast their ballots prior to the official Election Day. Early voting in person is allowed in 47 states and in
Washington, D.C., with no excuse required. Only Alabama, New Hampshire and Oregon do not allow early voting, while some counties in Idaho do not allow it. Mechanical voting machines were first used in the US in the 1892 elections in
Lockport, New York. The state of Massachusetts was one of the first states to adopt lever voting machines, doing so in 1899, but the state's Supreme Judicial Court ruled their usage unconstitutional in 1907. Lever machines grew in popularity despite controversies, with about two-thirds of votes for president in the
1964 United States presidential election cast with lever machines. Lever machine use declined to about 40% of votes in 1980, then 6% in 2008. Punch card voting equipment was developed in the 1960s, with about one-third of votes cast with punch cards in 1980. New York was the last state to phase out lever voting in response to the 2000
Help America Vote Act (HAVA), which allocated funds for the replacement of
lever machine and
punch card voting equipment. New York replaced its lever voting with optical scanning in 2010. In the 1960s, technology was developed that enabled paper ballots filled with pencil or ink to be
optically scanned rather than hand-counted. In 1980, about 2% of votes used optical scanning; this increased to 30% by 2000 and 60% by 2008. In the 1970s, the final major voting technology for the US was developed, the
DRE voting machine. In 1980, less than 1% of ballots were cast with DRE. Prevalence grew to 10% in 2000, then peaked at 38% in 2006. Because DREs are fully digital, with no paper trail of votes, backlash against them caused prevalence to drop to 33% in 2010. The voting equipment used by a given US county is related to the county's historical wealth. A county's use of punch cards in the year 2000 was positively correlated with the county's wealth in 1969, when punch card machines were at their peak of popularity. Counties with higher wealth in 1989 were less likely to still use punch cards in 2000. This supports the idea that punch cards were used in counties that were well-off in the 1960s, but whose wealth declined in the proceeding decades. Counties that maintained their wealth from the 1960s onwards could afford to replace punch card machines as they fell out of favor. ==Levels of election==