What type of legislature allows each state to have one vote?

The correct answer is a unicameral legislature. This type of legislature consists of a single chamber in which all legislative decisions are made. In a unicameral system, each state typically has equal representation, which means that every state gets one vote regardless of its population size. This structure contrasts with a bicameral legislature, where there are two chambers, often leading to different voting mechanisms based on population and representation.

The concept of equal representation in a unicameral legislature was notably demonstrated during the Articles of Confederation period, where each state, regardless of size, had one vote in Congress. This design aimed to ensure that smaller states had an equal say in the governance of the nation.

In contrast, choices like bicameral, federal, or national legislature refer to systems that incorporate more complex arrangements, often leading to variable voting power, representation, or structures that don't guarantee one state, one vote as a rule.