Answer:
- National.
Step-by-step explanation:
National histories are described as the consideration of nation-state as the central component of historical inspection and process(social, intellectual, or economic) accommodated in it.
As per the question, Charlene has been able to learn 'national histories' as Charlene regards his nation as his subject of analysis that has eventually led him to realize nation-state as his primary concern(as reflected by his familiarity towards Abraham Lincoln who is one of the most admired social and historic figures of his nation and exemplify a significant part of its development). Thus, 'national' histories is the answer.