Which sentences in this excerpt from "The Destiny of Colored Americans" by Frederick Douglass indicate the author's belief that white Americans and black Americans must unite for mutual benefit?

In an article, under the caption of "Government and its Subjects" (published in our last week’s paper), we called attention to the unwise, as well as the unjust policy usually adopted, by our Government, towards its colored citizens. The white man’s happiness cannot be purchased by the black man’s misery.