Question

party unity votes are roll - call votes in which a majority of one party lines up against a majority of the other party. party unity votes increase when the parties are polarized and when the party leadership can enforce discipline. why did the percentage of party unity votes decline in the 1970s? why has it risen in recent years?
party unity votes reached a 60 - year high in 2010 in the
the years after 1990 were characterized by a much greater degree of than were the years prior to 1970.
interest - group influence roll - call votes house partisan polarization senate *

Explanation:

• For the first blank: By observing the graph, the orange line (Senate) reaches a high point in 2010 compared to the other line (House).
• For the second blank: The text in the graph mentions that "Party - unity votes have increased as partisan polarization in Congress has increased", and the years after 1990 show higher party - unity votes (related to partisan polarization) than before 1970.

Answer:

Senate, partisan polarization