OTL the Ottonian branch of the house of Nassau was the first to go extinct in the male line in 1890, ending the personal union between the Netherlands an Luxembourg, But what if instead the Walramian branch died out first especially before the annexation of the duchy of Nassau in 1866, probably...
alternate succession
german empire
greater german empire
kingwilliamiiikingdom of the netherlands
luxembourg
nassau
possible personal unions
queen wilhelmina
the netherlands
King William III of the Netherlands, who died in 1890, outlived all three of his sons. His daughter Queen Wilhelmina was born in 1880 and succeeded him in 1890, under a regency of course by her mother. She reigned until her abdication in 1948 and died in 1962. Let's say Wilhelmina is never born...