Truman implemented this in response to two threats one being a communist-led uprising against the government in Greece and two being Soviet demands for some control of Turkey's Dardanelles. It was implemented in Berlin when Truman ordered U.S. planes to fly supplies to the people of West Berlin in response to the Soviet Union's 11 month blockade on Berlin.. or something among those lines
They reacted by having everyone work in the industry. While the men were fighting the war or making things that support the war, the women were also involved in production of weaponry and supplies. Even the children joined the war effort as Hitler's Youth, which was like a program for children to join the support of the government. When things got really serious and dangerous they even sent the children to fight.
The 4th class was required to go to ellis island.
They migrate due to altitudes during different times of the season