cloture
Columbus. That's why it's called "pre-Columbian" which means "before Columbus.
You can end a filibuster by a vote of Cloture which requires 60 votes to do so.
To defeat a filibuster, 3/5 of the senators (60) must sign a petition to invoke cloture on the filibuster. After the cloture, the filibuster must end in one hour after the signing.
Philip Nolan