Answer :
The Freedmen's Bureau had the most succes for African- Americans by helping their in securing educational opportunities during the reconstruction period. They construscted more than a thousand schools for the newly freed African- Americans and invested $4000 for the teacher-training institutions. They also provided practical aid for their transistion from slavery to freedom.
The Bureau of Refugees consituted an agency of the United States Department of War to "direct such issues of provisions, clothing, and fuel, as he may deem needful for the immediate and temporary shelter and supply of destitute and suffering refugees and freedmen and their wives and children."