1648
The Peace of Westphalia was signed at Muenster.
Treaty of Westphalia also known as the "Peace Of Westphalia"
It was signed in 1812
The date in which the Jay Treaty was signed was November 19, 1794.
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The treaty of Westphalia ended the Thirty Year's War
The 20 countries that originally signed the treaty establishing the International System are not specifically listed as there is no universally recognized treaty by that name. If you are referring to a specific treaty, such as the Treaty of Westphalia, the Paris Agreement, or another international accord, please clarify, and I can provide information on the relevant signatory countries.
April 30, 1803
The Dutch Revolt was resolved when the Treaty of Westphalia was signed in 1648, recognizing the independence of the Dutch Republic from Spain. The treaty secured religious freedom and autonomy for the Dutch provinces.
The term Peace of Westphalia denotes a series of peace treaties signed between May and October of 1648 in Osnabrück and Münster. These treaties ended the Thirty Years' War (1618-1648) in the Holy Roman Empire, and the Eighty Years' War (1568-1648) between Spain and the Dutch Republic.
1648
You need to specify which treaty. Over the centuries, hunderds of treaties have been signed.