Final answer:
The Vice President of the United States can cast a tie-breaking vote in the Senate if there is a tie on a proposed bill or nomination.
Step-by-step explanation:
In the United States, the Vice President serves as the President of the Senate. Normally, they do not have a vote, but they can cast a tie-breaking vote if there is a tie on a proposed bill or nomination. This means that if there is a tie vote in the Senate, the Vice President can step in and break the tie, ultimately deciding the outcome of the vote.