Which constitutional amendment prevents a state from making 21 the minimum voting age? a) 3rd b) 15th c) 19th d) 26th

The twenty-sixth amendment to the United Sates Constitution prohibits the states and the federal government from using age as a reason for denying the right to vote to citizens of the United Sates who are at least Eighteen years old.

26th

Explanation:

Because those people who win represent your city, state, country, etc. The president doesn't pass laws. The congress does. Even if he veto's them the congress cans till vote for that law. Every vote matters and counts.