It depends.
Some people study history to learn about the past, others study history because it's interesting, and some study it to learn from past mistakes.
A. The US made the Gadsden Purchase.
The US never sold Texas. US won the war. Mexican cession was the US taking land.
They all studied the social contract.
When water changes from liquid to gas at its boiling temperature the process is called vaporization. When this phase change occurs at a temperature below the boiling point it is called evaporation.
Answer:
Depending on who you ask you would get a different opinion. Many supporters of jazz found it liberating, exciting, it broke norms and gave freedom. It was a new and very creative way of playing music and dancing. It was a primarily black movement so many found it barbaric or immoral. Hating it because of race and class. It was seen by many that only uneducated people would like that kind of music while classical music was the real art of sophisticated people. Some music teachers also feared that it would make classical music seem boring and uninteresting to the younger generations.