Which theme is expressed most often Langston Hughes' poetry? the importance of music in African American culture
the role of economic issues in shaping American culture
the damage inflicted on his generation by warfare
the difficulty of forging an identity in the modern world

the damage inflicted on his generation by warfare

Explanation:

This is because the poems speak on the difficulty of racial discrimination during warfare and the suffering African and Americans went through

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.