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Congress Poland (Kingdom of Poland, 1815)

A rump kingdom created at the Congress of Vienna in personal union with the Russian Tsar, with its own constitution, army, and legislature (Sejm) — the last formally autonomous Polish state before full Russification. Autonomy was effectively ended by the crushing of the November Uprising (1830-31).

Lost its constitution, army, and separate legislature after the November Uprising (Organic Statute of 1832); nominally persisted as a titular 'Kingdom of Poland' under direct Russian administration until the name was phased out in favor of 'Vistula Land' after the 1863 January Uprising, with the last vestiges of separate status removed by the time of Russian withdrawal in 1915.

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Further reading

• God's Playground: A History of Poland, Volume 2 Norman Davies · 1981

  Covers Congress Poland's constitutional status and its erosion after 1830.

Sources

• Wikidata Q221457 'Congress Poland' — description 'territory in Eastern Europe in Russian empire (1815-1915)'; P571 inception 1815-06-09 (day precision); P576 dissolved 1915 (year precision only); item description also codes a 'sovereignty' qualifier ending 1867
• Wikipedia 'Congress Poland' — infobox constitution adopted 27 Nov 1815; article text: autonomy lost after November Uprising (29 Nov 1830), formalized by the Organic Statute of 1832 (abolished constitution/army/legislature); further centralization after the January Uprising of 1863 with 'Vistula Land' replacing the name in official usage; article explicitly states scholars disagree whether the entity's real end should be dated 1832, 1864, 1915, or 1918