Read it through once

The city of Baltimore presents the largest and most intelligent mass of free negroes found in the United States. These in an appeal to the citizens of Baltimore, and through them to the people of the United States, say, "we reside among you, and yet are strangers,--natives, yet not citizens--surrounded by the freest people and the most republican institutions in the world, and yet we enjoy none of the immunities of freedom. As long as we remain among you, we shall be a distinct race--an extraneous mass of men irrecoverably excluded from your institutions. Though we are not slaves--_we are not free_."