The nobility invented a system of "one-vote veto". This system, like the one-vote veto of the permanent members of the United Nations, can veto any decree. That is, all nobles have one vote of veto, that is, a law cannot be passed as long as one person disagrees.
In the Polish parliament, nobles quarreled and fought all day, but even without reform, laws beneficial to the people were promulgated. As a result, there was a great uprising in Ukraine, which was still Poland at that time. Polish winged cavalry seemed to have lost their magic in front of Cossack musketeers and were defeated again and again.
Since then, Sweden, Russia, Turkey and the Crimean Khanate invaded Poland at the same time. After the war, Poland lost 30% of its population and 20% of its territory, and it was not as good as before. Brandenburg also took the opportunity to become independent, and later it has evolved into a European tyrant-Prussia.
In the face of fiasco, Polish aristocrats are still obsessed with the "cooking" system, and no one is willing to reform at the expense of their own interests for the benefit of the country. Any policy that is beneficial to the country will be rejected by one vote.
Extended data
1, Poland is a country founded by the Western Slavs, and it is the same nation as the Eastern Slavs in Russia. Because Poland is located in the hinterland of Eastern Europe, which is beyond the reach of ancient Greece and Rome, Poland has never had the opportunity to contact with advanced cultural systems.
2. Poles, Czechs and Slovaks all belong to the Western Slavic nation, and they are also brothers with Russians, Belarusians and Ukrainians, but Russia and Belarus belong to the branch of Eastern Slavic.
Baidu Encyclopedia-Poland