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Basically, what are the effects if Henry V of England survives much longer than he did OTL? His death in 1422 at 36 was young even for the 100s, so we could probably have him live until the 1440s, maybe 1442 so we get exactly 20 more years out of him. Would England and France stay together under his rule?
To settle the children thing, here is his children ITL:
Henry V of England (b.1386: d.1442) m. Catherine de Valois (b.1401: d.1437) (a)