Nothing?
In a direct democracy, each citizen has the right to vote on every decision and issue.
Vote.
If you are 18 or older, you can vote as soon as you are a citizen provided you are properly registered.
vote
Vote.
Vote, hold public office, drive (in nearly all states), etc.
There is no constitutional "right" to vote. You cannot be prevented from voting due to race or gender, but constitutionally speaking there is no explicit "right" to vote.
list of all citizen who are qualified to vote in federal election and referendum
Yes
You can vote at age 18.
no you must be U.S citizen vote
so you can vote early