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In page History of Poland:
"During the reign of John II Casimir Vasa (r. 1648–1668), the third and last king of his dynasty, the nobles' democracy fell into decline as a result of foreign invasions and domestic disorder.[1][2] These calamities multiplied rather suddenly and marked the end of the Polish Golden Age. Their effect was to render the once powerful Commonwealth increasingly vulnerable to foreign intervention.[citation needed]
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