What was the biggest obstacle to women gaining more rights in the 1800s? women could not vote. only unmarried women had rights. women could not own property. only a few women went to college.

The correct answer is Women could not vote.

This sparked the famous Woman's Suffrage movement during the 1800's which in turn helped them get those rights which opened their way for many other rights such as working for equal pay as men and not being treated as just housewives.