Question

What was the most likely reason this poster was produced by the federal war manpower commission?

Answer 1

"to discourage discrimination in the workplace during wartime" is the answer i think

Answer 2

assuming that you're referring to the United we win poster,

The federal war manpower commission wanted to encourage minorities to enlist to the army.
Back then, we were completely at a disadvantage due to Germany's more advanced weapon, so we try to overwhelm them with numbers.