How did women obtain the right to vote in the united states?

After a hard-fought series of votes in the U.S. Congress and in state legislatures, the Nineteenth Amendment became part of the U.S. Constitution on August 18, 1920. It states, "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex."

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.