How did the Hundred Year’s War threaten the stability of medieval society?

The loss of all English-held territory in France except Calais. A high number of casualties amongst the nobility, particularly in France. A decline in trade, especially English wool and Gascon wine. A great wave of taxes to pay for the war which contributed to social unrest in both countries.

Explanation:

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answer; taking up arms to defend the nation;

the two things that develop a strong social foundation are: a. separation of church and states e. education received attention separation of church and states separate the illogical  argument that came from religious beliefs to a fact based belief. while education will make us remember the past to avoid the repeat of our mistakes.