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 | | Its political structure — that of a semi-federal, semi-confederal aristocratic republic — was formed in 1569 by the Union of Lublin, which united the Kingdom of Poland and the Grand Duchy of Lithuania, and lasted in this form until the adoption of the Constitution of May 3, 1791. |
 | | The other blow to the Commonwealth was the Swedish invasion in 1655 (supported by troops of Transylvanian duke George II Rakoczy and Friedrich Wilhelm I, Elector of Brandenburg), known as The Deluge, provoked by the policies of Commonwealth kings from the Swedish royal House of Vasa. |
 | | Estimated grain consumption in the Polish Crown (Poland proper) and Prussia in 1560–70 was some 113,000 tons of wheat (or 226,000 łaszt (a łaszt, or "last," being a large bulk measure; in the case of grain, about half a ton). |
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