Which of the following is a requirement to vote in Missouri?

In Missouri, one of the fundamental requirements to vote is that a person must be at least 18 years old on or before election day. This age requirement is a standard across the United States, aligning with the constitutional mandate that establishes 18 as the age of majority for voting purposes.

While residency requirements, identification needs, and political party affiliations can vary by state and can also influence the eligibility process, they are not universal prerequisites to the right to vote. In Missouri, all eligible citizens must meet the minimum age requirement to participate in elections. Therefore, being at least 18 years old is crucial for voter eligibility.