What refers a legislative act to a popular vote for final approval?

The term that refers to a legislative act being submitted to a popular vote for final approval is "referendum." This process allows the electorate to directly vote on specific legislative measures or constitutional amendments, ensuring that the decision reflects the will of the people. A referendum is often used in democratic systems to engage citizens in the legislative process and provide them with a direct voice on important issues.

In a referendum, the population votes either in favor of or against the proposed legislation, and the outcome determines whether the measure is enacted. This mechanism underscores the principle of direct democracy, where citizens actively participate in governance and decision-making.

The other options—poll, electoral review, and civic engagement—do not accurately capture this specific process. A poll typically refers to a survey to gauge public opinion rather than a formal vote on legislation. Electoral review may involve examining the electoral process itself but does not entail a public vote on legislative acts. Civic engagement encompasses a broader range of activities through which individuals participate in their community or democracy, but it does not specifically refer to the mechanism of voting on legislation.