Political parties are important in the us congress, because party affiliation determines which new laws must be written. allows for disagreements to be settled quickly. decides the importance of various committees. shapes the debate and controls legislative agenda.

Political parties are important in the US Congress, because party affiliation shapes the debate and controls legislative agenda.

In the United States, there are two main political parties: the Republican Party and the Democratic Party. Having these immensely different parties participate in the debates in Congress is key to truly represent the voice of every American citizen when it's time to approve or veto laws.

shapes the debate and controls legislative agenda.

the correct answer is a