everyone over 18
No.
The popular vote in each state determines who that state's electors will vote for.
Wyoming was the state to allow women to vote in1869.
In the presidential election, each state votes for a delegate that will represent the state in a whole and vote for the president.
Wyoming
Wyoming was the first state to allow women to vote. Thus the state motto is "The Equality State"
Each state
1896
Constitutional amendments must be ratified by the votes of 3/4 of the State Legislatures. There is no requirement for a plebiscite, or vote of the people. Each State Legislature can, if it chooses, base its decision on a popular vote, but I'm not aware that any do.
New York
New York
1880's