The treaty was the result of a series of lengthy negotiations that began in Messina (Sicily) in 1995 and ended in Amsterdam on 18 June 1997. It was formally signed into Eu law on 2 October 1997 and a long and complex ratification process began. The procedure was finally closed after ratification by the European Parliament on 19 November 1997 and after two referendums and 13 national parliamentary decisions in the Member States. The Treaty of Amsterdam was signed on 2 October 1997 and came into force on 1 May 1999. Its main changes have focused on the Treaty on the European Union, created in 1992 by the Maastricht Treaty. Article N of the Treaty on european Union, signed in Maastricht on 7 February 1992, set out provisions for the revision of the Treaty in 1996. That is why, on 29 March 1996 in Turin, the Fifteen convened an intergovernmental conference in Turin which, under the successive presidencies of Italy, Ireland and the Netherlands, drafted a treaty adopted by the European Council in Amsterdam on 16 and 17 June 1997. Before the treaty was signed in Amsterdam on 2 October by the foreign ministers of the 15 EU Member States, only minor changes were made. After ratification by all Member States, the Treaty of Amsterdam came into force on 1 May 1999. In June 1995, a year and a half after the 1992 Treaty on the European Union came into force, a think tank was set up to pave the way for a new Intergovernmental Conference. The group presented its report to the European Council in Madrid in December 1995. The conference, which was tasked with resolving some institutional issues and differentiating Member States in the integration process, opened in Turin in March 1996 and concluded at the European Council in Amsterdam on 16 and 17 June 1997.
As the Amsterdam Council reached a consensus on the draft document, the treaty was signed in Amsterdam on 2 October 1997. After ratification by the Member States, the Treaty of Amsterdam came into force on 1 May 1999. The Treaty of Amsterdam, officially the Treaty of Amsterdam amending the Treaty on the European Union, the treaties establishing the European Communities and certain related acts, was signed on 2 October 1997 and came into force on 1 May 1999;  It made substantial changes to the Maastricht Treaty, which had been signed in 1992. The treaty was the result of lengthy negotiations that began on 2 June 1995, almost forty years after the signing of the Treaty of Rome, in Messina( Italy, and ended in Amsterdam on 18 June 1997. Following the formal signing of the treaty on 2 October 1997, Member States followed an equally long and complex ratification process. The European Parliament approved the Treaty on 19 November 1997 and, after two referendums and 13 decisions by parliaments, the Member States completed the procedure. The most pressing concerns of ordinary Europeans, such as their legal and personal security, immigration and the fight against fraud, have all been addressed in other chapters of the treaty. In particular, the EU has become responsible for immigration legislation, civil law or civil procedures, as it is necessary for the free movement of people within the EU. At the same time, intergovernmental cooperation in the field of police and criminal justice has intensified to enable Member States to better coordinate their activities.