The Kansas-Nebraska act was strongly supported by the south.
Most likely your sister is experiencing "frustration."
In psychology, frustration is a typical passionate reaction to restriction, identified with outrage, irritation and disillusionment, disappointment emerges from the apparent protection from the satisfaction of a person's will or objective and is probably going to increment when a will or objective is denied or blocked.
Social media is an instant reach to billions of people, when human rights violations occur they are not so easily squashed and contained and many people are able to find out about it. Sometimes sparking worldwide outrage. As an example look for a journalist who was killed in South America recently.
Because it is so instantaneous many people feel it violated their right to privacy and security and safety. Pictures of you can be shared with the world in second along with the fact that many social media websites have tracking applications that know where you go, who you are with and can even monitor the rest of the activity on your phone. This is why you may get ads for things you looked up.
Well back in the day, men could vote and women couldn't, and usually, women weren't accepted into schools.