Explain the significance of the role of African Americans in the Union war effort during the Civil War.

Explain the significance of the role of African Americans in the Union war effort during the Civil War.

textbook reference:
Liberty, Equality, Power: A History of the American People,
Volume 1: To 1877
7th Edition, 2020
ISBN-13: 9780357022313
John M. Murrin, Pekka Hmlinen, Paul E. Johnson, Denver Brunsman, James
M. McPherson, Alice Fahs, Gary Gerstle, Emily S. Rosenberg, and Norman L.
Rosenberg
Cengage