Elections in US are held once in four years. The whole process begins one-year in advance before the General Presidential Election for electing the president. The US Constitution is divided into three branches of Government.

The branches are Legislative, Executive, and Judicial. The congress which is again divided into two parts,heads the legislative branch. The first part is represented by House of Representatives and the other part by Senate.

President along with Vice President Heads the Executive Branch. Supreme Court controls the judicial system. There is a parliamentary democracy in USA and people through Voting elect the president. The tenure of an US President is for a period of 4 years and can be extended for another 4 years, so the total number of years that a person can be US President is 8 Years at most.

President along with Vice President Heads the Executive Branch. Supreme Court controls the judicial system. There is a parliamentary democracy in USA and people through Voting elect the president. The tenure of an US President is for a period of 4 years and can be extended for another 4 years, so the total number of years that a person can be US President is 8 Years at most.

Cabinet members are appointed by the President who do not take part in the legislature, which is generally the case in most of the parliamentary systems of government. The voters determine the future member of the house on the election day where all the 435 seats are at stake and they elect one third of the US Senate, where 50 states are represented by 100 Senators, which underlies a two year term, US Senate reelects it's members every two years.

or filling a vacancy, special elections take place which are broken up into three types Primary (Called the Primaries),general and the local elections.

Primary Election :
In the congressional election process if more than one candidate from the same party seeks to fight then primary election is held. Where candidates are nominated by political parties and then votes are given. There are two types of Primaries election. Open election and Closed election. In open election any eligible voter can vote regardless of which party he represents where as in close election only members of the respective party can vote. Primary elections start in January and last until June in the election year.

General Election :
This election is held to choose the final candidate which are nominated by parties running as independents or Write-In-candidates. In addition where the division of party candidates is not decided in the primary the runoffs take place in general election. A General election is held on the first Tuesday of November in even-numbered years called the Election Day. The candidate getting the highest number of votes wins.

In presidential elections, electoral votes are allotted equal to the sum of US representations and senators from that state. District of Columbia has three electoral votes even though it is not a state.

The presidential candidate who wins more number of votes wins that state's electoral votes. Once the elections in states are certified, the votes won by each candidate are counted.

If a candidate receives at least 270 electoral votes out of 538 then he is declared as the winner and if no one wins with a majority then House of Representatives choose a winner, with one vote each for states.