Based on your own knowledge, why are partisanship and a two-party system significant parts of US politics?

Answer:

Because there are only two major parties, US citizens feel that they only have a choice between one party or the other.

Because there are only two major parties, the parties tend to disagree greatly on many issues, taking either one extreme side of the argument or the other.

At times, there have been attempts to create a viable third party, but these parties rarely have enough support to be on an equal footing with the two main parties.

Explanation:

Plato answer

Answer: Albeit the Founding Fathers never planned it to be like this, partisanship and a two party framework are critical pieces of US legislative issues since they take into consideration "groups to be shaped"- - groups that can more readily get across specific thoughts and party stages to general society.  

Since there are just two significant gatherings, US residents feel that they just host a decision between one get-together or the other.  

Since there are just two significant gatherings, the gatherings will in general differ enormously on many issues, taking possibly one outrageous side of the contention or the other.  

On occasion, there have been endeavors to make a suitable outsider, yet these gatherings infrequently have sufficient help to be on an equivalent balance with the two fundamental gatherings.