1- "I, Too" reflects the speaker's desire to be accepted as part of America. The speaker is an African -American slave. The "I" stands for the African- American speaker and the " too" stands for the fact that he has to be accepted as part of the American nation. The period reflected in the poem ,then, is that of racism during the early 20's in TheU.S.
2- The main theme seen through the poem is patriotism. The speaker is " the darker brother". He has got white brothers in America. They all sing America.
3- Cullen 's poems are also reflective of racism. He deals with the African -American's soul and their emotions. He is worried about the situation of the African- Americans in Harlem. After they fought in the WWI, they could not get any job in the U.S. However, Cullen also deals with the union of blacks and whites in his poems.