Which state became the first to allow women the right to vote when it was admitted to the union in 1890?

Wyoming

Explanation:

At the end of the XIX Century, women started working for social and economic equality, both in Europe and in the US. For example, in New Zeland women gained the right to vote in 1893.

When Wyoming was admitted into the Union, governor John Allen Campbell approved the first law in United States history explicitly granting women the right to vote.

So the answer is Wyoming.

1.d 2.a c.!