So what happened to make the 13 colonies no longer want to be British?

Short Taxation without Representation

Longer The colonist were being taxed on many things like tea, paper, newspapers, sugar, etc, which lead to the Boston Tea Party. They wanted independence, they wanted to control their own government, tax their own products, and live by their rules. They didn't have the same rights as  actual citizens of Great Britain did.

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

c) troops march forward in close formation against newer, more accurate weapons