Respuesta :
As the nation's identity has grown and changed over time, that growth and change is reflected in American literature
I believe the answer is: As the nation's identity has grown and changed over time, that growth and change is reflected in American literature
Literature is created through observation, whether its an observation of one's culture, relationship with other people, or history.
As a nation's identity grow, various culture would also start to developed, which means that there would be more objects of observation to write literature.