UK History: Chapter 5, Exercise 3 — Possible Solution
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LONG-TERM CAUSE
Feudal disputes over the Duchy of Aquitaine.

TRIGGER
Edward III's claim to the French throne after Charles IV died in 1328 without
male heirs; the French nobility rejected it under Salic law and chose
Philip VI.

NOT EXPLAINED
Why the war began in 1337 and not 1328, or how the two causes should be
weighed.