Why author in 'Let America be America Again' criticize his country and whether you agree or disagree with his criticism?

While Langston Hughes's tone is softer than that of Malcolm X or the Black Panthers (not surprising, since Hughes lived in a different era), he has his own way of denouncing racism and depicting the oppression that African Americans experienced at the hands of the patriarchal system. He alludes to lost and forgotten aspirations, insinuating that African Americans are not allowed access to the American Dream because of their race. In “Mother to Son,” the mother describes the various vicissitudes she has faced, exacerbated or directly caused by the color of her skin. In “On the Road,” one of Hughes’s best known short stories, he depicts racism as being tied up with religious hypocrisy. Hughes is realistic about the discriminatory environment that he lives in, but he also expresses hope that one day, the racial inequality in America will start to even out.

The second part of your question calls for your opinion.