As per the Constitution of the United States of America:
The American Congress is the bicameral legislative body i.e., having two Houses. The Congress consists of Senate (Upper House) and House of Representatives (Lower House).
There are two elected Senators from each State making the total number of Senators to be 100 who. The Vice President of the United States is the presiding officer of the Senate and is termed as president of the Senate who may cast decisive vote in the event of a tie in the Senate.
Senators must be 30 years of age, U.S. citizens for at least nine years and residents of the state that they represent. They are elected to serve for a term of six years with one-third of its members being elected every two years. Every constituent state in U.S. whether it is large or small area wise, elects two senators and both of them represent the entire state from which they are elected.