Answer:
“The women worked as ammunition testers, switchboard operators, stock takers. They went into every kind of factory devoted to the production of war materials, from the most dangerous posts in munition plants to the delicate sewing in aeroplane factories.”
Because there were too many Chinese come to america for build railroad and want to be american citizen
That phrase works perfectly! Although if you’d prefer a phrase that rhymes, Join the war and fight off shore might work (idk)
Otherwise, this works perfectly with your poster and would help express the symbolism you’ve provided!
Good luck and your poster looks rest so far!