what is the ratification of this treaty mentioned?
In Ireland, the Eleventh Amendment of the Constitution, allowing the state to ratify the Treaty, was approved in a referendum held on 18 June 1992.
Maastricht Treaty
In Ireland, the Eleventh Amendment of the Constitution, allowing the state to ratify the Treaty, was approved in a referendum held on 18 June 1992 with the support of 69.1% of votes cast. 
who is kiliaen van rensselaer (merchant)? A Dutch diamond and pearl merchant. where are the above mentioned people from? UNANSWERABLE where was this person born? Hasselt, Overijssel, Netherlands. what is the history behind this first mentioned town? During the Middle Ages, it became one of the free cities of the county of Loon. what are the transport available here? Transport by bus, and train. where did the last mentioned country name originate from? UNANSWERABLE what is the geology behind this land mentioned latter? It is mostly composed of deltaic, coastal and eolian derived sediments during the Pleistocene glacial and interglacial periods. what happened here during the prehistoric times? The oldest human traces were found in higher soils, near Maastricht, from what is believed to be about 250,000 years ago. what happened after world war ii to this place where human traces were found? Several European institutions found their base in Maastricht. In 1981 and 1991 European Councils were held in Maastricht, the latter one resulting a year later in the signing of the Maastricht Treaty, leading to the creation of the European Union and the euro.
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Maastricht Treaty [SEP] Ratification
The Treaty noted that it should be "ratified by the High Contracting Parties in accordance with their respective constitutional requirement". In the cases of Denmark, France and Ireland this required referenda. In the first Danish referendum, on 2 June 1992, the treaty was rejected by a margin of 50.7% to 49.3%. Concessions secured by the end of year in Edinburgh including, critically, the same exemption secured by Britain from the single currency (Denmark would not have to give up the krone), allowed for a second referendum. On 18 May 1993, Maastricht Treaty was endorsed by a vote of 56.7%. In Ireland, the Eleventh Amendment of the Constitution, allowing the state to ratify the Treaty, was approved in a referendum held on 18 June 1992 with the support of 69.1% of votes cast.