The Dutch got their independence from this country in 1648 when the Peace of Westphalia was signed
The 
Treaty of Westphalia of 1648, bringing an end to the Thirty Years' War, which had 
.... set by Mazarin for the Peace of Westphalia, which was signed on Oct. 24, 
1648, ..... Had the British and Dutch monopolies of the time been reasonable in 
their... [DOC] [TLE] 30 Years War - aftermath [PAR] In January, Spain had already recognized the independence of the Dutch 
Republic.