Answer:
to create changes among the social classes
Explanation:
The U.S. Bureau<span> of Refugees, </span>Freedmen<span> and Abandoned Lands, popularly known as the </span>Freedmen's Bureau<span>, was established in 1865 by Congress to help former black slaves and poor whites in the South in the aftermath of the U.S. Civil War (1861-65).</span>
Angela Warren...look at the superscript number after the sentence that references the flying buttresses and them look below to the source that corresponds with that number (3)