Final answer:
Elizabeth Kolbert harbors hope for America's future based on the belief that a clear understanding of our nation's challenges could spark societal change and cultural reform.
Step-by-step explanation:
Elizabeth Kolbert's hope for America's future seems to be rooted in the recognition of the gravity of the challenges the nation faces and the belief that understanding these challenges is the motivation for societal change. The excerpts imply that there is an upbeat-adjacent possibility of cultural reform and a critical revolution in understanding. The historic narrative of America, with references to pioneers like Forten Grimké and Gorman, alongside the symbolic imagery of 'American Progress,' reflect a national spirit of resilience and continual enlightenment. Kolbert seems to argue that by appreciating the weight of our challenges, such as those surrounding the American Dream, and acting proactively to address them, there is hope for progress and adaptation in the face of difficult times.