Until 1973, homosexuality was considered a psychological disorder by the American Psychological Association. Which sociological perspective would be most concerned with why this was considered an illness, and what effect that diagnosis had on society

I suppose they considered homosexuality a psychological disorder/illness because it wasn't heard of before. Today, when a person comes out as a homosexual, there'll be joy and acceptance but back then, you wouldn't be considered 'normal'.  

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.