Historical Influence

There was this question, rather interesting, showed up in a pop quiz/test/some time during class that I do not remember. The most important thing is, is there any literature unaffected by the time its written, and its a NO. Definitely, there are absolutely NO literature that is completely independent of its time. During the start of America, there is excess optimism, followed by some low tide known as the Civil War. Later again, there is optimism, best associated with the American Dream. However, the low tide hits again. Another war, and with the introduction of photographs, more grievance were brought behind the line. Why do people change ideals? simply because its outdated. Its no longer a fit for the time. Optimism isn't suited for bad times and vice versa. Its like you don't put sour milk into cocoa or put cocoa beans with mold all over it in milk. (Ok, I understand this metaphor is a fail, but as long as you get it, its fine)The American Dream is torn by violence, hunger, fury and more. It shattered into pieces. Like my ex-ex- article, arts reflect what artists thought, and events alter those thoughts. So these events indirectly influence those works.