The Nineteenth Amendment, adopted in 1919, granted the right to vote to all women in the US, but many Western States granted women suffrage before that. The first State to grant suffrage to women was Wyoming in 1869, that is to say fifty years before. How to explain such a difference? Were the mentalities in the West different from the East? Does this have something to do with Westward Colonization?
There's definitely room for someone to write a new answer, as the one I'm going to link to is rather old, but as the last few times the question's come up it hasn't gotten any responses ...
/u/kittyhawk39701 gave a cromulent response to Is it true that the campaign for women's suffrage in the US was more to convince women to support suffrage than lawmakers? that gets to the heart of it.