After the war, most women who were working in the factories:

Give up some of the job positions that they have gained.  

Explanation:

Historically during war times women had to pitch in and support the efforts from home. They usually take jobs in factories and cut their expenditure as the military need the most of the country budget.  

Once the war was over some of the women lost their jobs as the returning men need to go back to their usual occupations.

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during the early years of world war i, the germans used "the submarine" to a great advantage