Why do you have a two party system?

Answer 1

The US did not originally have a two party system. There were several parties in the beginning, and even George Washington warned against the two party system. Over the years however, the Democratic Party and the Republican Party have become the dominant parties in the US. There are still other parties, such as the Independant, Green, Socialist, and even Communist parties. Usually these parties don't get enough votes or attention to become popular though.