Asking who gave women the vote first in the Americas yields five defensible answers, because first can mean first law, ballot, constitution, or national election. Untangling them shows suffrage arrived when it was useful to someone in power, and the United States' claim to hemispheric leadership dissolves. The story runs from Matilde Hidalgo's 1924 ballot in Ecuador to Paraguay in 1961.
The competing firsts are definitional rather than factual. The Rita Ribera detail is beloved in Uruguay but rests on thin documentation.