Help please:/

Which of the following is a contribution made by units of the US Colored t
O Helped to create new rules for soldier conduct
Proved that they served best in integrated units
Served only in roles requiring manual labor
Proved their worth on the battlefield many times and earned the respe
white Union soldiers

The answer is D. Proved their worth on the battlefield many times and earned the respect of the white Union soldiers, If you need anymore help, feel free to contact me.

Explanation:

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these acts divided the south into five military districts.