We’ve all heard about the women’s suffrage movement and how women were finally given the right to vote with the approval of the 19th amendment. But in truth, many states had already granted women the right to vote—just not all states. Women in Wyoming had been voting since 1890, with Colorado following close behind in 1893. The 19th amendment, approved in 1919, forced all states to follow what many were already doing.
But I do not think they were allowed to serve in congress.
I hope this helps!