Answer:
While most African Americans serving at the beginning of WWII were assigned to non-combat units and relegated to service duties, such as supply, maintenance, and transportation, their work behind front lines was equally vital to the war effort.
Before time zones, towns just used the sun and the point at which the sun was highest in the sky to determine noon and time in general. Since this isn't the exact same for all areas in the United States, the train schedules were always off. So, when railroad companies developed the time zones we use today, it made the time the same for vast areas so that everyone was going on the same exact time.
Chemical weapons
Both sides developed lethal forms of chemical welfare that resulted to death of thousands in the trench war.Germany was the first to employ chemical weapons and it is estimated that over 10,000 tonnes of chemical gas, lethal and poisonous was blown.
