The United States holds its federal elections on the first Tuesday in November.
Each of the 435 seats in the United States House of Representatives are elected to two-year terms.
The 100 members in the United States Senate are elected to six-year terms, with one-third of them being renewed every two years.
Each state originally set their own separate date for their congressional elections.
Before the Twentieth Amendment to the United States Constitution was ratified in 1933, the date on which a Congress usually began was March 4 of the odd-numbered year instead of early January.