{"id":628000,"date":"2026-01-19T00:56:01","date_gmt":"2026-01-18T23:56:01","guid":{"rendered":"https:\/\/cronologia-universale.it\/20th-century-4\/"},"modified":"2026-01-19T00:56:01","modified_gmt":"2026-01-18T23:56:01","slug":"december-9-1991","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/december-9-1991\/","title":{"rendered":"December 9, 1991"},"content":{"rendered":"<p>The summit of the twelve European Union countries opens in Maastricht, the Netherlands, where monetary union will be decided. This is one of the final steps in the creation of the European Union. The heads of state of the dozen members of what was then the European Community meet to finalize the lengthy negotiations that will give rise to the Maastricht Treaty, the legal foundation of the European Union.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The summit of the twelve European Union countries opens in Maastricht, the Netherlands, where monetary&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-628000","post","type-post","status-publish","format-standard","hentry","category-s-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>December 9, 1991 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/december-9-1991\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"December 9, 1991 - 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