In 1992 the was created. It resulted in easier trade and
travel between the European nations and later
came up with a common currency called the
Euro. Page 292

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Sounds like the Treaties of the European Union, or The Maastricht Treaty of 1992 more specifically.
Hope this helps!!

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.