A number of bilateral and multilateral free trade agreements have made goods controls less intrusive; The completion of the European internal market in 1992 led to the end of goods controls. However, during the riots in Northern Ireland, British military checkpoints occurred at major border crossings and British security forces made some, but not all, crossing points impassable. In 2005, in the implementation phase of the 1998 Good Friday Agreement, the last of the border checkpoints was abolished.  Since about 2005, the border has been considered invisible, with little or no physical infrastructure, with security barriers and checkpoints removed as a result of processes introduced by the Good Friday Agreement (or “Belfast Agreement”), signed in 1998.    This agreement has the status of both an international treaty between the United Kingdom and the Republic of Ireland (the Anglo-Irish Agreement) and an agreement between the parties in Northern Ireland (multi-party agreement). The Good Friday/Belfast Agreement, signed in 1998, put an end to the sectarian conflict and power-sharing established in Northern Ireland. The agreement provides for EU membership, both for the UK and Ireland, and provides that the governments of the UNITED Kingdom and Ireland can cooperate in EU affairs. “The guarantee of a free trade agreement with the EU without tariffs and zero quota remains essential for the future of businesses in the UK,” said Ann McGregor, Director General of the Northern Ireland Chamber of Commerce and Industry. We urge ministers to redouble their efforts to reach a comprehensive agreement with our main trading partner at a crucial time in the negotiations. The EU and the UK have agreed on continued funding for the PEACE programme. If compliance is still not restored as a result of these measures, the parties are allowed to appropriately suspend the application of the withdrawal agreement itself, with the exception of the rights of citizens or parties to other agreements between the Union and the United Kingdom.
As co-chairs of the Joint Committee on the Implementation of the Agreement, the two members met, with which representatives of the executive and ambassadors from the 27 Member States of Northern Ireland became a video link. On 23 June 2016, the UK voted in a referendum to leave the EU. On 29 March 2017, Theresa May, then Prime Minister of the United Kingdom, wrote to european Council President Donald Tusk triggering Article 50 of the Treaty on European Union, triggering the process for a member state to leave the EU.