In most such systems it’s a simple majority vote of a unicameral legislator. The uniqueness of the USA is the bicameral legislature with de facto veto by the mi

In most such systems it’s a simple majority vote of a unicameral legislator. The uniqueness of the USA is the bicameral legislature with de facto veto by the minority by refusing cloture. Without at 8-10 members of the minority breaking ranks (depending on the actual split), a unified minority can cause complete gridlock.