The main world leaders at the time were
Hitler - Germany
Franklin D. Roosevelt - USA
Mussolini - italy
Churchill - Britain
stalin- russia
Answer:
Well if you look at the Pacific side of the war the war against the Japanese and Chinese started in 1937, but if you looking more west Germany started the war after invading Poland which was in 1939.
Explanation:
Part A: Working hours changed from around 14 hours a day before the 1880's to being reduced slowly down to 12, then 10, eventually moving to an 8 hour day. This change allowed for workers to to have more time to sleep and for leisure. Another change was the end of child labor. Similar to the decrease in hours, the minimum age increased over time as well moving from 10 to 16.
Part B: One strategy used by unions to achieve these goals were strikes. Workers would leave the job and picket outside of a job which shut down operations. This tactic did not work at first because there were plenty of workers to fill the jobs. However, when immigration slowed the tactic had more impact with no people to fill the jobs. Some strikes were so large they brought the attention of police forces and the government.