Which of the following has significantly contributed to increased partisan polarization in the United States?

More multilateral agreements and a diminishing number of international commitments conducted via treaty do not risk lessening the impact of the Senate on foreign relations in the future

Indicate whether the statement is true or false

Of the post–World War II measures approved by Congress, the ____________________ had the greatest institutional significance on foreign policy.

Fill in the blank(s) with the appropriate word(s).