The Harlem Renaissance was a movement of African- American art music, literature and theatre. What inspired Harlem Renaissance artists was them wanting to take control of the narrative, representation and view of black people because black people were always painted in a negative light by white people. The artists asserted pride, joy, positivity in the black community and changed how people viewed black people. They fought against the inequality and discrimination they faced everyday.
The statement "The inhabitants of the United States have...properly speaking, no literature." is inaccurate. Literature may work through grammar syntax and semantics but there is no existing standards that would make a piece of work qualify as literature. There is only different levels and complexity but no absolute requirement.
Intrasitive is the answer for sure
An infinitive is the word "to" plus a verb so if you see that in a sentence its probably an.infinitive (I'll give an example below)
Ex: Renee suprised her sister to scare her.
-The infinitive would be "to scare" because it could be mistaken as a verb but the actual verb is "surprised"
Hope that helped!