Children used to work in factories due to child labor. The men would be off fighting in wars and the women would work at factories or stayed at home. With children they didn't have to get paid because of their age and were treated badly. That is why they were chosen to start working in factories.
It would be the "Lend-Lease Act" that <span>authorized the United States to provide war supplies to other countries, since this allowed the UN to aid Great Britain in the fight against Germany without technically entering the war. </span>
"<span>(1) Large numbers of people migrated" would be the best option as to the development that encapsulates all of these events in history. Communism did not play a role. </span>
Answer:
I think the kingdom i might be wrong