Which statement best describes how african americans in the south contributed to the union war effort

African Americans staged work slowdowns.

Explanation:

they staged work slowdowns to negotiate some of the terms of their labor since their freedom was denied by law, Slaves used this to go against contest the rules of slaveholders and to assert their right to control their own lives

indigenous people north and south were displaced, died of disease, and were killed by europeans through slavery, rxpe, and war. in 1491, about 145 million people lived in the western hemisphere. by 1691, the population of indigenous americans had declined by 90-95 percent, or by around 130 million people."