In many cultures, sexual orientation has very strict rules or expectations to follow. People in strict cultures, who are against "homosexuals" and what not, will most likely stay straight because they want to feel accepted and not be judged or critisezed or in some cases even harmed because of their different sexual orientation. So basically their sexual orientation depends on the opinions of others in their culture.
Art of persuasion occurs when the interested people focus on the arguments and records that respond with a favorable thought. Are implicit and effective and thus get more easily attracted by a message that is delivered by someone and that some shares a relationship or a close connection with that person.
Southerners wanted to develop industry because they relied on the North for their industry, but since they were in a war the North was not giving them anything.